>I'm doing a project on a local staging server, and I need to replicate changes to the database structures to the 'live' server from time to time.

I use XCase to do this. The only thing it doesn't handle is security, so I have to remember to manually deal with that on the live server. XCase is more expensive than SQLCompare, for example, but it is a complete database design tool.

See www.xcase.com. The reseller in the US is www.f1tech.com.