What I love is scientific names. Like Absolute Zero, Freezing Point, Terminal Velocity, and Inertia to name a few. Combine these with the above methods and you'll have something really creative!
Also, I think alliteration works well. If you are going a garden site, you could copy the W3C address and have G3.org (Gorgeous Green Grass) I think those work really well. Hope these start the flow of ideas!