We're going to Bruges/Brugge in a few weeks and, having just read Chris Heathcote's recent post from Papercamp which mentioned customised guidebooks, I thought I'd put them to the test for our upcoming trip...
Tripwolf, a European start-up, which I've seen mentioned a few times is apparently "...a social travel guide for the discerning traveler that combines professional editorial travel tips with traveler generated content". It didn't really impress me. You select your destination and then download the free PDF, there's no registration. But the downloaded guide contained very limited information, just a few named highlights and lots of hotels and restaurants with little information apart from the address and a very basic Google map that doesn't look much use.

traveldk from Dorling Kindersley and the Eyewitness travel guides was much better. You first have to register and then there is a large amount of content that you can browse for your chosen location. It's not organised particularly well, there's just a big list of attractions, restaurants and shops which you have to click through to see more details before selecting it to be added to your guide. There are some "Top 10s" as well, but you only get summary information. Having selected your content you can then shuffle the pages/articles around, add some chapter pages, some blurb and a cover photo. The site then creates your guide and you can buy a full-colour PDF for £2.50 or spend £10 to get it professionally printed and bound. I just got the PDF so I can't comment on the book version. As well as your selected items you get colour maps of the area (I ended up with Bruges, Brussels and a few more Belgian towns).

This was a much better experience but I have a few criticisms. There is a lot of clicking to get the content you want and it would be easier if you could just select everything related to that city/country. Organising the book was also difficult as you just get a drag-and-drop Flash interface showing article titles (which were generally Flemish names!). And the content turns out to be fairly brief, which isn't necessarily bad though more in-depth info would have been good as an option. But the worst part is that there is no preview - so you have to pay the money before you see what you've created - I was a bit disappointed that most of the individual articles were identical to the summaries in the "Top 10" sections - so I ended up with a lot of repetition in the guide and pages that I'll throw away. Finally, you can share your customised guide so other users can purchase it.
Now the next two aren't really personalised but are worth mentioning as a comparison.

Lonely Planet sell single chapters of most (?) of their guidebooks as PDFs. I got the Western Flanders and Bruges chapter for £3.36, which gets you 50 pages, 19 pages of them about Bruges plus a map, all exactly as in the guidebook. Pretty good option for a weekend away I think.

I had originally bought the Rough Guide "Directions Bruges & Ghent" for the trip and on searching for this I found this page...
"Please enter the first word on page 17 of the Bruges DIRECTIONS guide as your password to access the e-books:"
...which then lets you download the entire book as a PDF - very nice and totally unexpected.
So overall it depends what you're looking for. Convenience? Cost? Portability? Pre-trip reading? The "personalised" guidebooks aren't really personalised in any meaningful way but the Dorling Kindersley one goes furthest in the right directions but needs more detail and a preview function. With all of these options you lose a bit of the cultural and historical background that you'll get in a full-size country guidebook and they'll be most appropriate for short trips and weekend breaks. I'm happiest with the actual paper guidebook I think and after all it's only the price of a couple of beers...