Ask HN: How do you create wireframes?

Asking for "the best" is subjective. I've never used the following but recent HN post regarding wireframe apps for Apple iPad was:

http://news.ycombinator.com/item?id=2090046

http://www.imockups.com/

Using the search link on HN with the term <wireframe> should provide plenty of hits. I think there's a YC funded company that deals with wireframe software, but I'm not certain if this is correct?

I use http://balsamiq.com and love it.

Axure is cool but it's pretty expensive. It's the only one I've used (and I only used the trial - yeah I don't wireframe all that much :). It was great but I'm going to try a few others before shelling out the dough for a license.

http://keynotekungfu.com/ clickable.