I went to a basball game yesterday and filled my 8GB phone with pics, then on the train back was listening to a 1:08:00 techno mix then tried flipping through Safari and got the iPod to quit often. I was also able to get iPod to quit during coverflow and even just flipping through the long legal page and then used a regular song from moulin rouge and it still managed to quit. So I thought it was a problem with lack of space. I sunk my phone, took the pics off, and took off a bunch of unwanted songs. Tried again, and was able to get it to quit again. Tried a long song and a short song, and was able to get the iPod to quit both times, and this is with 1+GB available. Lastly, during the day today, I started getting the phone app to quit when music wasn't playing. I restarted (held down both sleep and home for 10 sec) and got the apple logo boot up, and after that, it's been running smoothly. I was almost ready to take it in because I was able to get it to quit on demand basically. It's good to know I'm not the only one.
-Brian