Well if you have the Homebrew Channel, you can enjoy Castlevania Bloodlines and other 'not on the VC yet' titles (including Symphony of the Night and Haunted Castle).
I happen so have CV1,2,3,4,DraculaXX,Rondo of Blood, Bloodlines, CVAdventure, CVA2, CVLegends, and Symphony of the Night, on my Wii memory card (though Rondo of Blood is best if you play the VC version, rather than the emulated version, since the CD-Emulation is weird right now and the emulator needs some help; it's playable and pretty, but requires configuring).