Sparse Disk Image from Tiger to Leopard
 

I realize issues with Leopard are still being worked out, but after reading through the blog and threads, I'm still not sure what to do here:

I've been backing up with Smart Updates to a Sparse Disk Image in Tiger. I'm now using Leopard. Can I Smart Update to the same SDI I've been using, or do I need (or is it simply better) to create a new one?

gracias,
-c

You'll be able to use the same image after the Leopard version is released. For now, though, I'd suggest using Time Machine...