I've been writing about Weebly for a couple years now. They continue to impress me. I haven't had my hands on the iPad app yet, but my bet is that it'll be easy to use and thoughtfully made. They consistently ship excellent software.
What's funny to me is that Weebly generally flies under the radar of the tech press. And yet in terms of profitable YC companies, they have to be near the top. David Rusenko has even talked about going public with Weebly (not unprecedented for website builders: Wix did it earlier this year).
Weebly is a company worth taking a close look at.