I finally managed to get rid of it...

When it installed the process was not running and refused to run, so I couldn't enable the uninstall string.

Following the instructions on here using rootsh corrupted my application catalogs and killed app manager...

However Restoring a backup in the N900 (I make them daily) reinstated all my apps and settings except Imhere-3.0 which was nowhere to be seen and everything runs fine now (I hope this help at least a few people).

Regards
MixtLupus