Perl! It's so nice that so useful site is written in Perl. By the way, I like Mojolicious (since 1.0 version) too.
Why since 1.0?
I don't see any signification changes since 1.0...
Isn't it more stable?
Love it. I've used Catalyst for some project, but I've now been looking at Mojo and I like the look of it. Haven't used it much yes so I can't comment on details, but it looks solid
Catalyst applications are very heavy, but i didn't found any problems in running catalyst application that i wrote year ago on latest Catalyst version.
Mojolicious is lightweight and easier to install, but its design is still under development, so API changes sometimes. Expect there will be not so much changes in new stable versions.
Don't get me wrong, I think Catalyst is great. But I liked the look of Mojo (and Mojo::Lite) -- as I said I haven't used it much but I'll try to use it in a project soon -- I also think it's good for Perl as a whole that there's an easy to install / easy to use modern framework.