Thinking about switching over to Slackware 14 from Kubuntu (12.04-12.10) and the only thing holding me back (as stupid as it may seem) is a way to get the plasma menu bar in Slackware.

I've searched repos all over to try and find a package for Slackware and no luck. I've even tried to find the source but was a bit confused on what was exactly needed. In Kubuntu it's installed as default, and it's in the repos as "plasma-widget-menubar" which, as I understand, is the universal package name for this plasmoid. However, there might be more to it than this? I don't know.

Can anyone point me in the right direction? Icontasks (which is included in 4.8.x) and the menubar are two things I'm use to using in KDE and don't want to part with.

Do you mean the one that acts like the Mac menubar? If so, it already appears to be installed by default on KDE 4.9.2 (and quite possibly the official KDE 4.8.x that ships with Slackware). Unofficial packages for 4.9.2 are available at http://alien.slackbook.org/ktown/14.0/ from a member of the Slackware team.

I ended up getting Slackware installed and checked to see if it were available in 4.8.5, which it isn't. So I upgraded from the repo you linked and installed 4.9.2 and still don't see it when I search for widgets from the "Add Widgets" list.

My mistake. At some point, I must have compiled and installed that widget to try it out. Fortunately, there's actually a very easy way of getting it installed on you system.

First, download src2pkg-2.7-noarch-2.txz.
Then run the following as root:
The src2pkg tool is very useful for creating Slackware packages from source. Sorry for misleading you with my first reply.