Makes more sense here than in Modules.

Quite shortly, I'm going to be without an internet connection. During that time, I may, or may not, do some work on a theme. What I'm wondering is, is there anywhere that I can get a .zip/.tar of a large amount of recent modules?

I know a few sites where I can get individual ones, but obviously, due to my situation, a load of useful ones lumped together would be of a lot more use to me.

No. I think it might even infringe on some personal copyrights to do that?

you dont need that many to make a theme.
just get all the xModules ;)

If you want to download many modules at once, check out
ModuleGui-1.0!
With this tool you can download all modules, which are hosted on http://www.ls-universe.info.