I've never tried any level of integration with the IDE, and it is an intriguing idea. However, if you are merely putting build scripts into subversion, it is very simple to do it by hand using TortoiseSVN. After all, this is generally the only requirement, unless you have several people working concurrently on the same database, at which point I'd advise saving each database object separately.
I'd like to get around to a more automated system, but in the meantime the discipline of adding a comment as to why you've made the change is a good one. and TortoiseSVN is such a good product.
I started off hating Subversion but the recent improvements, including an automated Windows install, has made it a good choice for Source-control.