The original VNC can be found at
RealVNC. Personally, though, I have found
UltraVNC to be the best because the server can be set to scale your screen. If you're on a QVGA device, and can read the smaller print, this gives you more screen space, which is kinda helpful.
Check out the documentation on their website, it has quite a bit of info on how to use it.
(Edit: Fixed QVA to read QVGA)