D&D online references

[Regal Worm of Slopp]

I have been playing 3.0E for awhile, and our group is now deciding whether or not to switch over to 3.5. I do not have any 3.5 books, and before buying any I would like to at least see some of the exact changes, and i play a Ranger, (which by all accounts seems to be the most revamped), and I was wondering, where can i go online that will have the info just ythe same as the book would?

P.S. Does anyboy have any input on whether or not it is worth it to change over to 3.5?

 

[Terraism]

I prefer 3.5, but you'll have arguments from both sides. Most of the revised information is available on the official SRD site - I prefer this one, though.