Pingus

Another really good clone and worth playing: Pingus. Its lemmings, but with penguins, which means you don't have to feel bad if some die, just pretend they're those diehard linux nuts who hate everyone, then you'll be glad to blow them up to make a path for more to get to the finish.

This is another really well-done game, it took the original and expanded upon it. Tastes great, less filling.

Ubuntu: $ sudo aptitude install pingus
Website (Windows/Mac ports): http://pingus.seul.org/

I'll try to get some more games worth playing down in this next week, and less filler art.