Yes, It really is that simple, Simon.
It seems to be a popular idea, too.
As it happens I, for my sins, am a software engineer. I work on databases and websites, have done for 18 years now. Esentially, because you have done all the hard work and built the database, set up the site, got pages and templates all working, it's just a tiny tiny tweak in the instructions. When I say code, I dont mean machine code. It's not scary binary, it's ASP and SQL through ODBC, which is very much human-readable. and the logic, the meaning, is clear.
Just change the line that says:
"SELECT * FROM tblThreads WHERE CategoryID=123"
to
"SELECT * FROM tblThreads WHERE MemberID=123"
...and then go put the kettle on. You're done. Put your feet up, wait for the lavish praise.
As I said. I just got here. I am not trying to be awkward or start some kind or revolution. Just trying to make this site (and the world in general) a slightly better place, is all.
Steve