I'm glad to hear you like your new iPod! I recently upgraded from a 20 gig 3rd gen to a 30 gig color one. I had under 100 mb of space left on my 20, so when the 30 gb ones went on sale right after the line was shortened to only the 20 and 40 gb iPods, I got one for only $300 with my student discount.
The color screen is very nice, and I love always having my photos on hand. It's quite usuful if I want to show someone what my cat looks like, or something I saw on vacation. Plus it's fun to just browse through my photos when I'm out somewhere and bored (like in the waiting room at a doctor's office). You might also find that it's a lot more fun to play solitare with a color screen.
Oh, and
mad jew, I live in Florida, and we get some pretty harsh sunlight here too (though not as bad as Australia, at least from what I remember when I was there about 3 years ago). The color screen looks great in the sunlight, as long as you have the backlight on. It doesn't look too bad without the backlight either, just a bit dimmer.
Capt Underpants, a nice case to look into would be the Contour Design Showcase. It makes your iPod look really nice; I've actually gotten quite a few compliments on it. It does add some bulk to your iPod, but it provides really great protection, and you can still enjoy the beauty of your iPod. My biggest worry when I bought it was the bulkiness, but it doesn't really matter at all to me anymore. It goes in and out of the case very easily, you just flip the latch up and take your iPod out or put it back in, so it's great if you want to dock your iPod. Silicone cases are a pain to get on and off, and other cases can scratch your iPod if you keep slipping it in and out. At $30, it is a bit expensive, but worth it in my opinion. Oh, and if you do decide to get one, I'd recommend the black version over the white. The black just looks nicer, and the white one gets stained easily.
Links:
here and
here
Enjoy your new iPod!