Weddings are big business off the net and seem like they are ripe with innovation. While theknot.com has set itself up as the major player online - anyone who visits that site will see how awful it is.
So here are my questions for discussions:
1) How could you innovate this space and take advantage of cumbersome sites like the knot?
2) What other industries lend parallels to the Wedding space?
You're starting from the feeling that existing sites are cumbersome. Do you think this is a problem? They are presumably packed with information. Could you present the same information more cleanly, or dedicate your site to a certain kind of information?
Are you married yourself? If not, I would talk to a bunch of people who are to find out what they found difficult organizing it all. You might get some insights that way.