DBA.StackExchange.com is a Stack Overflow site that’s specifically targeted at database administrators. There tend to be some pretty interesting questions in there – not just for SQL Server, but all kinds of databases – but at the same time, there’s also a lot of noise.
To help find fun questions, I use The Power of SQL. Data.StackExchange.com is a web-based front end, kinda like SSMS, that lets you run queries against a recently-restored copy of the Stack Overflow databases. It’s different from the downloadable Stack Overflow database because it’s updated much closer to real time, and you don’t have to