The mobile browsing experience on this phone is fairly unique. It uses a mobile browser but can render ordinary web pages really well. It may not be as good as the iPhone browser, but it handles everything really well.
Whenever you connect, or use an application to connect, you can select the most appropriate connection. Whilst some may find this annoying, it'll save you money when connecting to a WLAN point than using 3G when it's not needed.
Nokia Maps is a free service which lets you search around your location for places of interest, buildings, banks and fun things to do. Many more free applications like this are available from the Nokia website.
Having a productivity suite on your phone is something you don't often get. Nokia includes this word processor, which has more features than Windows Mobile Word, and with the QWERTY keyboard, I find it a piece of cake to take notes in a lecture or write articles on the go.