Trying too hard
The author tries way too hard to make this into a romance novel. The various descriptions of DC being a woman in high heels and yet in a business suit, and riding in limos and also sleeping on the streets, etc. were hyper annoying. I enjoy good prose, this was not it. And it's a travel book, not a harlequin novel. Aside from the tone, I found the information offered was often lacking. There was nothing about the numerous options for paid tours of the city's historic sites. There was very little useful in the dining section if you wanted something more than cafe fare.
I usually love books in the Lonely Planet series, but this one didn't measure up.

A great travel companion
Being a travel junky I found this guidebook very valuable. Some points:

1. It has color maps all located in the same place (back of the book). On the backside of each map is an index with a page reference! So you see the map, you flip and find the attraction/restaurant/whatever, and you go to the referenced page for more info. This is invaluable since the last thing I like doing is flipping through maps embedded throughout a book only to not get any information on what's around me.

2. Did I mention the maps? There is also a subway map overlay on each map so you can plan getting there and getting back. There's also a complete map at the very back.

3. It's a compact book. This is a BIG deal. Lug around a monstrous book for a day and you'll be ripping out unneeded pages later that night (which is a good idea anyway, really). This guide was slim and fit nicely in an outside pocket. Just enough history to occupy the time on the subway, not so much as to displace Washington's biography.

4. It's a well built book. Bend it, fold it, get it wet. It's going to stay together and readable. While weathered guide books held together with rubber bands show some flair, it's no good when you're standing there on a corner with pages falling all over.

Overall a highly recommended guide book. I try and find the best overall guide book for whatever my destination and keep coming back to the Lonely Planet.

Another good guide from Lonely Planet
I went for a vacation in Washington DC for a week. This book kept me going. I had a little problem with their updates (the walking tour for Embassy Row still lists a certain mansion as the Pakistani Embassy, but it turns out that the embassy moved somewhere else back in 2005, a good two years ago). But aside from that, things were still well-covered.

I disagree with the previous reviewer saying that there were no directions from BWI or IAD, but p. 263 gives the information about this. Regarding public transportation in the National Mall and Tidal Basin, there aren't a lot of options, but all the available options were given in the extensive maps at the back of the book. One really should prepare for large amounts of walking for this area of the city. And regarding the parking spaces, the book also gives information about how to get to places using public transportation, for every time that they give information about parking spaces. So I do not see why it can be concluded that the authors researched this using a car.

A travel guide is just that, just a guide. It shouldn't be mistaken for a tour operator. One should not rely on it a hundred percent. It simply gives suggestions on where to go and what to visit. For my purposes, it served its purpose well.

Lame for LP
I took this book with me on a one week trip to DC. I was mightily disappointed. It started with the trip from the airport. I had to pre-plan on the internet, which took awhile, because the book offers no advice for getting from BWI or Dulles into DC.

There is no useful information on how to get around DC, most notably to the Jefferson, Lincoln and FDR Memorials. It wasn't until the end of the trip that I figured out what options there were for public transportation to this end of the mall and the Tidal Basin. A good guidebook should guide you, not make you search all week for the answer.

The authors apparently used a car to get around. Lots of info on parking spaces. So if you're traveling by car (fat chance at hotel parking being $41 a night), this book might be for you.

The restaurant listings dwell excessively on expensive places to eat. Mostly with bad food. I guess if you can afford to park in DC, you can afford to spend $50 on a bad dinner.

Contrary to another reviewer below, the book seemed to be entirely without opinion, at least where it was needed. But this has been a pattern at LP lately. The Air and Space Museum? Feels like walking into a museum that hasn't been changed since 1986. All the guys walking around with sub-machine guns strapped over their shoulders? Makes you feel like you're visiting El Salvador. And the 'bag checks' at the Smithsonians, one after another, each making you hold your bag in a specific way unique to each security guard. Those would be useful opinions.

You can get just as much useful information as contained in this book (actually more) from the DC's visitors websites.

Usual high standard
Good book, lots of detail, good maps, good details of accomodation (though this is a bit pointless in the internet age I think), food options... just a standard, good LP. If you like format of LP you'll like this.