@dlowan,
I only have Opera installed for compatibility testing and have no bookmarks, so if you need specific instructions let me know and I'll have to set them up.
But what you can do is export them from Opera to an HTML file, and import them into IE to then import them to Chrome.
But what I really recommend is importing them to an online service (I use delicious.com) and then you can access them from any browser and any computer. Chrome lacks plugins right now but you can get Delicious access through bookmarklets (let me know if you want to set this up).