Oh, I'm so jealous of you all who are planning weddings! I had *so* much fun planning mine!!
The one general thing I will say because nobody has said it so far -- just remember that it is *your* day. Of course I'm not suggesting that being a snotty brat is a good idea, but I always hate hearing about people who do things at their weddings to make other people happy even though it's not what they want to do. For example, I have a few good friends who had ultra religious ceremonies to please their families, even though they didn't really believe in it. It's great to make others happy (although that's not what a wedding is about) but when you start out your wedding by saying things that you don't believe or don't mean, I think you are setting yourself up for failure. One friend who did this is already divorced, and I'm not saying that the ceremony is the cause, but I think it's important to go into a marriage saying what you mean and meaning what you say.
I was blessed with supportive, wonderful parents who happily wrote checks and either agreed with what I wanted to do or came around eventually, and inlaws who didn't have much to say about anything. Our wedding was (very) unconventional in many respects, so it was great to have the support of my (wonderful) parents.
Okay -- as far as websites -- what I found most helpful and interesting was looking at websites made by actual couples who had gotten married or were planning their weddings. For example, I liked
www.tnj.net a lot -- the "our wedding" part is really nice. I would search yahoo for things like "our wedding" and browse the results. I found some of the wedding guides to be rather cheesy, although I did like the magazines, especially Martha Stewart. We found our cake idea and I found my dress in Bride's.
Whatever you do, relax and have fun. After all the work planning the wedding and doing everything the way I wanted it to be done (I really planned every little detail, but not to the point where I was psycho), our actual wedding day itself was the most fun day of my life. There were a few minor mishaps (we didn't have enough wine, so the caterers had to go out and get more) but overall it was as perfect as I could have wanted.
Oh -- a quick side note -- I don't know what, if anything you are wearing on your head, but you may want to wear it around a while first. I wore a tiara, and the thing was digging into the side of my head all night and it hurt. Had I worn it more first, I would have been able to stretch it out a little so it wouldn't have hurt so much.
Good luck!!! You will have SO much fun!