Although you can install the new Indie 2.6 (aka "Unity") on as many machines as you like, apparently the license restrictions of 2.5 still apply to 2.5. Per a PM from HiggyB:

In short, the pre-existing Indie license will still be bound to two machines. But anyone can grab and install the new free version (same features/functionality) as many times and on as many machines as they like.

The above is correct, you can feel free to take the new Unity (free version) and install it wherever you like.