Hi Jeromy,
We've had no customers asking for slack, so far. I'm not opposed to it, as we hope to address as many platforms as is economically feasible. Slack doesn't have very good package management (ala yum/apt-get/up2date/urpmi) but we have to solve that problem for FreeBSD and Gentoo (which we have had some pretty vocal requests for) so there's no reason we can't solve it in the same way for Slackware.
I haven't actually solved the problem for FreeBSD or Gentoo, however, so it's hard to estimate exactly when Virtualmin Professional will be available on the non-package manager platforms.
There is a poll going on here:
http://www.virtualmin.com/voteYou can vote for what OS you'd most like to see Virtualmin Professional on. We are paying attention, and the results of the polls, plus the feedback we get from early adopters, will dictate where we go with the product.
In the short term, our OS support list, in order of appearence over the next few days/weeks, looks like this:
Fedora
RHEL/CentOS
SuSE
Mandriva
FreeBSD
Debian
Gentoo
Ubuntu
...whatever comes after...
I'd like to have all of these rolling out the door by the end of the month, though some of them might prove more difficult than I anticipate.
We will be focusing on the latest couple of releases of each OS, so that we don't have to commit to maintaining support for very old systems, especially since there are a few packages that we have to provide ourselves and can't be pulled directly frmo the vendor.
Hope this answers your questions.
I suppose I should also note that if you're bold enough, you can make Virtualmin run on any OS that Webmin supports. We'll help as best we can, and we'll integrate as much of what is learned during the process into our installer as possible. It is entirely possible that if you've got some experience with your OS' inner workings, and some virtual hosting experience, you can jumpstart the support for your OS. We aren't going to fight you if you try to run it somewhere we don't support yet.