I place my flash movies (.SWF and html file that references the .SWF file) into a FLASH folder on my CF card. then i just use PIE (pocket internet explorer) to open the html file in the flash folder. flash is a little tricky and not all flash files will run smoothly on the pocket pc, especially if they weren't developed for pocket pcs in mind. for more info you can hit:
www.flashenabled.com
www.flashthefuture.com
Regards, Lee