+1 on Lubuntu on my Acer TK57 laptop with 2GB RAM. The thing flies on Lubuntu and has none of the inherent lag with flash found in Ubuntu (9.10). It is beta, so don't expect it to be a finished OS yet, but it's got no issues on my machine other than no GUI method of doing updates (must sudo apt-get update), but not a big deal at all. Otherwise it's fairly sparse in the menus, but looks good and is fast in everything I do.
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