Here is a flash emulation of the 909 drum machine. There’s also a pseudo-303 emulator in Flash as well.
Speaking of Synths, a lot of people have been talking about the new Prophet 8 lately. I have no doubt it will be a nice synth when it comes out but I think i’d only pick one up if I were already looking for a Prophet 5. I live Dave Smith’s work though, I have his PEK but the 4 more voices for the Prophet 8 aren’t enough for me to sell off my PEK for one. We’ll see, when it comes out and I play around on one I might change my mind.