Database Change Management using hand generated scripts [closed]
Have you looked at Open DBDiff yet? It may be a good place to start.
if you change your mind about open source, Red Gate's SQL Compare is the way to go IMO.
There's a pretty interesting project called SQLRunner on SourceForge - it's C#, it's .NET, it's past "pre-alpha" :-)
I've not used it myself, but still - looks quite good, IMHO.
Marc