Storing data in a C# .Net application

I need a time management program to track the time I spend writing code on my PC. After looking at several items available on the Internet I quickly came to the following conclusions

• Some of the software is overly complex for what I want
• Some of the software costs too much or is just plain crap
• It’s just a simple database app, I can write those in my sleep

So, with the third point in my head, I’m going to. I need a simple database system though, all my current .NET software uses SQL Server because I’m writing multi-user stock control systems and suchlike. This is a total overkill for my own little side project, so what’s the best way to do it?

I’ve asked this question over on StackOverflow.com, so if you have any ideas either reply there or comment on this post.