Does anyone know how to save your customization of the Tabs into their different areas? Such as having the multiplayer on the bottom of the screen and the Chat on the left side of the screen and having the DL's on the right side?

Unfortunately, the toolkit that SpringLobby is built on -- specifically, the part that allows the customization -- provides support for saving layouts, but not layouts of the tabbed notebook controls that SL uses.

The SL devs (or you or me) could certainly emulate the functionality using workarounds already posted to the web, and it might eventually get fixed the right way (http://trac.wxwidgets.org/ticket/10466). Don't hold your breath on the official fix, though.

I'm guessing a bastardized "click here for old tasclient layout" button would make a lot of people happy.