Subversion is my source control of choice after experience with source safe and subversion.
Developing with .net I find the commit dialog cluttered with files that are not relevant and should be ignored. Since v1.5, ignoring patterns of files and folders is a life saver to help prevent missing files that I should be checking in.
Another tip I find useful is adding external assembly binaries with a "Latest" version folder:
Repo A
- Proj1
- Lib(External retrieves latest binary of Repo B)
Repo B (Library)
- Proj1
- Proj2
- Binaries
- v1
- Latest
That way, when I do an update, I get the latest external assemblies too.
What tips and tricks do you have for making life with Subversion easier and as a developer?