If you don't have a PC Engine or TurboGrafx-16, you can participate by hugging your Wii--after you purchase, say, Castlevania: Rondo of Blood, which hit the Virtual Console service this morning.
You'll have to hand over 900 Nintendo points ($9) before you can download the Toru Hagihara-designed title, but if you're any sort of Castlevania fan I think you'll find it's well worth the premium price.
PS3 owners with Japanese PSN accounts can get in on the PC Engine/TurboGrafx-16 love, too--though they can't (yet) buy Castlevania: Rondo of Blood.
In fact, the "Game Archives" section of Sony's download service currently contains just 15 cartridge-based PC Engine titles at this point. (It'll get its first CD game--the guitar-laden Gate of Thunder--on Wednesday, according to andriasang.com.)
See also: 'Better late than never: 'The best Castlevania ever' is coming to the States'