I've shared a link to download my .tgz of the node-0.8.15 source, compiled on my model B 512MB Raspberry Pi.
You can use this to save yourself having to cross-compile or waiting the 2 odd hours it takes to compile it on your Raspberry Pi.
Simply download, untar, enter the directory and run 'make install'.
I'll try and keep this collection up to date as more versions are released. I'm trying to keep it to the current release version.