Blender is 2.41 in Dapper, and that comes out on Thursday.
The Beta for Dapper is actually quite stable, too, so you can use that now.
Otherwise, there's no need to make a .deb. You can just compile it from source with the .tar.gz.
If you feel the need, for some strange reason, to make the .tar.gz into a .deb, try CheckInstall:
https://wiki.ubuntu.com/CheckInstall