My 2 cents
IMP is by far the best webmail client, but - and I installed all versions till v3 - the new version is really hard to install. Why isn't it possible to only require default libs and compiliation of Apache/php as eg. Fedora delivers from CD ?
Or at least a tutorial/manual for adaption of eg. Fedora 2/3 without recompiling nearly the whole distribution (okay, nearly .-) would be fine. At this point the sw may be great, but if only few people can install it or that know-how isn't distributed then the install base is smaller then it should be.
Just my 2 cents.
Re: should be as easy as Pixory to install
Gallery is really easy to install, no database backend no real horrible tool dependencies.
And version 1.4 has really "nice" error messages .-)