This is a list of useful travel sites that Twitterers contributed to. Got any others to add? - Robert Scoble

Oh how many posts did you write today! : ) Thanks for again. - Erhan Erdogan

Erhan: I'm done now until tomorrow morning when 100+ companies release all their news on us. Whew. - Robert Scoble

Wikitravel, Yahoo Trip Planner, TripAdvisor for research and ideas. TripIt feeding iCal data to Dopplr (mostly works). - jh

Haven't used it but this http://www.tripharbor.com is interesting - Brian Sullivan

Robert's been a busy boy today! :o) Thanks for the good reads! - Susan Beebe

Don't forget http://www.offbeatguides.com/ for personalized travel books. Still in private beta, but more to come soon. ;-) - David Sifry

i use tripit and that's about it these days. most of the times i can buy a plane ticket cheaper from the website of the airline i'm using then kayak and orbitz you can follow my trips on tripit if interested, same username - Jonathan Jesse

especially as it works on my moblie phone - Jonathan Jesse

wouldja add UpTake.com to the list? (and before u bash our home page only 5% of our traffic starts there lol) - Elliott Ng

www.tripntale.com - darwin

http://www.goldentulip.com, working for this chain though.. - Marcel van der Laan

How could I have missed this post? Wego @ http://www.wego.com . Disclaimer: I am a Web Developer with Wego. - Winston Teo

yowtrip.com - Luca Filigheddu

http://www.wolpy.com - For tracking your travels - Ana Belén Ramón

http://www.viatribe.com - a travel writer community, and a great resource for quality reviews - Dana

http://www.londontown.com/hotelma... - All London hotels on a map, real time bookings - James

The easiest way to find where to stay is http://www.seeyourhotel.com. Which is a site we did. For flight it's http://www.kayak.com. - Jean-Francois Noel

This list (+FF thread) is awesome! I also find it entertaining that for once instead of retweeting Scoble, he referenced my tweet :P - Abbas Haider Ali

I'll also add in my vote for TripAdvisor, I don't go anywhere new without checking there first. And Hotwire for hotels (if trip is 100% confirmed). I get ridiculous deals on Hotwire for 5 stars hotels in great 'hoods in specific cities like Atlanta, Toronto, Montreal, and London. - Abbas Haider Ali

This is a great list. I'm happy to share our recently launched company, www.AirBedandBreakfast.com. The international, peer-to-peer travel site allows you to book rooms with locals, instead of hotel rooms. In addition to saving money, the host becomes your guidebook, offering a local perspective on things like nightlife, coffee shops, events, and sites to see. - Joe, co-founder - AirBed & Breakfast

I use VMlive.com on my blackberry. The ability to forward the itinerary from my AMEX based corporate travel dept. and have all the details of flights, rental car and hotel at my finger tips is great. The feature of how it integrates with blackberry is particularly valuable. Check it out! - Tim FitzGerald

Abbas, I like TripAdvisor too. That's why UpTake searches TripAdvisor, Yahoo!, Virtual Tourist, and 1000 other sites with reviews all at once. Try it out! (disclosure: I am UpTake co-founder) - Elliott Ng

For course Kayak but Vayama flight maps are great and some internatinoal flights are picked up that aren't on kayak. http://www.vayama.com. Priceline bidding for hotels, especially 4 star in city centers. International Travel: http://Booking.com and http://www.hotelpricebot.com. Agoda.com was helpful for Asia. Favorite boutique hotels site is http://www.i-escape.com - traveldragon