generally for any package you can go here: http://maemo.org/packages/
searc for the package you want to feed back on, select the version/repo combination and on that veraion you can vote and leave comments.

so for the most recent witter that is http://maemo.org/packages/package_in...itter/0.2.1-8/

however, everytime i upload a new version to testing it effectively loses the history of votes for a preious version.
which i find slightly weird.
and i am hoping to upload another big update at leas to devel later today. and assuming i can resolve some issues I'd promote to testing later in the week.

feedback on issues is always helpful, but I'm inclined to say hold off on votes until i have a version that looks good enough to be in extras.