Pidgin has a autoaccept plugin, which works... BUT(!) you have to manually set users from whom you want to autoaccept stuff, because the default behaveiour is to ask the user. If you're a windblows user, this is probably a smart thing, but some of us are not worried about virii etc. so people like me want the autoaccept plugin to autoaccept everything.
This is a one line dirty hack, which does the job.
The patch still works on pidgin-2.5.8