Hi Jeroen, I just became aware of this site, and hope to discover more of it gradually.
I'm just checking if you like an idea we got on another forum. We dreamt up what somebody just told us you'd already made. Here's the thread FYI, though I'm afraid it's Norwegian:
www.padleforbundet.no/forum/index.php?topic=3216.0
Our idea, not knowing about your database, was a quick and easy way to look up the recorded speeds of kayaks that just beat you by 30 secs to the goal line. I'm new to sea kayak competitions, and I'd like to see how well I fared, though it'll never be perfect.
A good deal of data is easily available from various competitions, and I'll be the first to offer help in converting those data into the format you'd like - if you'd like it at all that is. And should you want more of our thoughts on how it could be solved, just ask!
Other than that, your database is just like we dreamed of!