Originally posted by Hoya Paranoia:
www.kayak.com
seconded.
i was a sidestep user, but have since switched to kayak. i will never use orbitz again after a christmas-new years trip fiasco (well, that was more us airways fault, but orbitz was no help with the problem either).
and pollard is correct, use these sites for finding the fares, but then go to the airlines web pages to book them- fares will normally be about $5-10 cheaper, and you get bonus miles for booking online.
as for planning. . .i would recommend finding the cheapest flight you can to london or dublin or even paris, and use that city as your jumping off point by using the european budget carriers (like ryan air) to get to other places in europe. be forewarned that some budget carrier cities may be 50 miles or more away from the destination.