Letadla, letiště, atd. / Airplanes, airports, etc.

FlyerTalk - frequent traveler server
Airways - info a diskuze o všem kolem letadel
Planes - info o všem kolem letectví

Matrix - helps to find air tickets
CheckMyTrip - view your trip
TripIt - keep track of your travel

Seatguru - what's the best seat in the aircraft?
Airline Quality - which arlines are OK?
Airline Meals - what meal you can expect?

Vše o cestování / All about travelling

TripAdvisor - hotel reviews
Wikitravel - free travel guides
In Your Pocket - free city guides
BootsnAll - travel forum

Fotografování / Photography

DPreview - news and reviews of digital cameras
Photo.net - website about evrything concerning photography
43 rumors - rumors about 4/3 and m4/3 systems