Tomtom 6 does run but you will need a piece of software which changes the screen resolution from 480x800 to 480x640. Some kind soul has written some software to do this as this problem first arose on the Toshiba G900. See
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Tomtom will run fine but you will have a black band accross the bottom of the screen which does nothing. (the bottom 160 pixels in fact). Some of the colours can go a little odd depending on what panel your running too. A bit of experimentation will remove this problem though. The satnav software itself runs fine.
Tomtom 7 will also run on this phone and supports the 480x800 resolution. However, it has not been released yet so if you want a copy you will have to resort to some of the pre-release versions which can be found via the likes of bitorrent.