I use Vine Server for OS X (formerly OSXvnc, you can download it from:
http://www.redstonesoftware.com/products/vine/server/vineosx/index.html )
Vine Server is a full featured VNC server for Mac OS X providing remote access to the GUI, keyboard and mouse using Vine Viewer or any other VNC client. Vine Server offers a rich and unique feature set among Mac OS X VNC servers including:
* Flexible port assignment for multiple VNC servers on a single computer
* System servers that run independently of user accounts
* Outstanding clipboard sharing; Exchange of rich text, images, files and applications when used with Vine Viewer
Plus, Vine Server is a full Universal Binary For Improved Intel performance and it is offered by Redstone for FREE.