Definitley worth it! My DW gave me one for christmas and i cant put it down. I havent touched my laptop in a week. It is great for internet and the battery life is amazing. My only complaint is that it doesnt support flash, so some of the websites will not work on it. However, it does have alot of features and new apps are rolled out every day. I still odnt have any books for it, but all of the popular news publications are rolling out IPAD specific news media for it (nytimes,etc).
On a related note, I plan on using the ipad when we travel, including camping, to access basic information, read, watch movies,etc. I have the 3g equipped model, so wifi is not required (i.e. certain campgrounds/hotels). It is great for accessing information while on the road. It is so compact, easy to store, and the battery life is unbelievable.
Feel free to pm with any questions and ill try to help. Craigslist also had a ton of them for sale in my area, but most were wifi only. Also, the android tablets are slowly coming out as well, and they are a little cheaper.
I will say this, I have yet to meet a person that has an ipad and doesnt like it...just my .02!
Good luck!