sway isn't grime. and although dizzee rascal came out of grime he isn't really representative of the whole scene.
grime is the closest thing to an indiginous form of hiphop in the uk
listen to the mix sessions on this myspace page:
http://www.myspace.com/djlogansama
dubstep is kind of the instrumental version of grime, only dubbier
burial
http://profile.myspace.com/index.cfm?fuseaction=user.viewprofile&friendid=609 68411
kode9
http://www.myspace.com/kode9
if you want to hear the best grime though you should try and track down some rips of live radio sets from either ruff sqwad, nasty crew, roll deep or newham generals. you should be able to find them quite easily on whatever filesharing program i reckon.