certainly the think outside mouse is compatable, it's made for PPC

but i've seen plenty of posts on this site from other people using other BT enabled mouse/kbd's, just search the forums for posts
It's all down to what profiles you have installed/enabled in your BT stack. In it's standard guise the axim BT stack comes with headset support, serial, activesync etc etc but not keyboard or mouse support. In theory some mice use the serial bluetooth profile so may work, although i've not read of any so you'll probably end having to install some update to enable mouse support.
Has anyone here used any other manufacturers BT mouse with the thinkoutside installed stack? (the thinkoutside drivers are available as a download from thier site)