I used this today, would recommend it for simple remote control, chat, and file transfer.
Download SharedView
Microsoft SharedView is a fast, easy way to share documents and screen views with small groups of friends or coworkers; anytime, anywhere. Use SharedView to put your heads together and collaborate - create, convey, and communicate…across physical boundaries, through firewalls, and down to the smallest details.
Here's the FAQ
Read the complete post at http://wmug.co.uk/blogs/r0b/archive/2008/12/03/microsoft-sharedview.aspx