A kernel panic isn't the end of the world, but it may be an indicator of problem.
Are you running the stock memory or have you upgraded the memory from stock recently? Have you installed any new hardware drivers recently? It is rare that a software application can trigger a kernel panic, but it's not impossible. Any new apps installed recently?
What were you doing on your MBP when the kernel panic happened?
Don't forget that OS X does have bugs. It's possible that you're stumbled on an anomaly, which is often difficult to replicate (for reporting to Apple) and you may never see it again.
Keep an eye on it. As I mentioned, you may never see another kernel panic. If they start occurring regularly, you'll need to dig deeper and (hopefully) determine how to replicate it.
Hope this helps.
The New iPad WiFi 16GB
iPhone 4 32GB (Telus)
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MacBook Pro 15" - Late 2008 2.4GHz C2D, 8GB, 250GB SSD