I tried LogMeIn and although it looks pretty cool, it's useless for the iPhone. The remote control works, but it expects that you have a mouse. There's no way to right-click and a double click is interpreted by the iPhone as a zoom-out, so all you can do is single click, making it unusable. Bummer.
The only solution I've found to work well on the iPhone for remote control is a modified tight-vnc I found here: http://cre.ations.net/creation/webvnc---remote-desktop--vnc-on-your-iphone.