I find a good way to surf for sites using flash is hunt down one you like and you more than likely find a link to the designers. They will have links to other sites they have done. Then when you have seen enough of their sites look for anothe and repeat.... When you have satisfied that hunger for inspriation you might want to do a bit of research here on Flash - usability and accessibility - you might be surprised at what you learn ;)
As for posting links to specific sites - it is frowned upon here so that people don't promote their own sites.