The problem with Ximian is they have no pre-compiled software for slackware. They have RedHat 6.2,7.1,7.2,7.3,8.0, a couple versions of Suse, Debian, and Yellow Dog but I don't know if any of that is compatible. Also, they don't have source for RedCarpet but I guess what i'm really concerned with is whether or not the service would work under slackware. It's basically an updating system for Ximian's software so on the surface there doesn't seem like there should be any problems, but i know that is seldom the case.
I'm unsure what version of Evolution is in Slackware-current (or Mozilla for that matter) but I do know the versions that were in the 8.1 iso are out of date.
Anyway, thanks for the info on pkgtool, i knew it was there but i haven't really used it yet, i'm still just monkeying around with my slack computer. Also thanks for the responses.