You may also be thinking of
LogMeIn - this gives you remote desktop control over one Windows PC for free.
I have not tried them together, but it seems like the ideal solution would be to get LogMeIn and Avvenu to run at the same time - use Avvenu for free access to files from any browser (or your Treo) and LogMeIn for free desktop access (but doesn't work from the Treo). LogMeIn has file access, but only in the paid version (once the trial expires).