Currently, there is a small contest within the VB community, so there are plenty of links to playable games in one spot:

VB Gaming Contest

Definately worth checking out is eRacer, downloadable (with source) from:

the nexus it is at the very bottom of the page.

Also, head over to the Galaxy message board at:
Lucky''s VB Gaming Site for a public alpha for a nice space shooter type thing there.

Other urls... if I could remember the URL to the tech test of my rts then I''d post it , you might be able to find a game of mine at:

Traffic Jam, but I''m not sure if it is still there.

You might want to have a visit to planet source code for some other games, I haven''t checked any of them out, and you are likely to find 100 examples of pong , but there will probably be some nice stuff, with source included.

Trying is the first step towards failure.