One of my main reasons for switching to google reader was because of the excellent mobile interface. However, on my n91 I kept getting "Out of memory" errors after browsing a few pages. Restarting the phone would make the error go away, but again only for a few pages. Well, that's not cool. But, apparently it's a problem just in the default browser (based on webkit). While I applaud nokia for using a free, standards-compliant engine for their browser base, I kinda needs something that works.
Enter Opera mini. Mini is opera's free mobile browser, and while not open source, it at least works and seems to work quite well. I've never been a huge fan of opera's browser on the desktop, but they're my current mobile browser of choice.