It's something similar to what's in webos: you can create normal apps with html/css/js
You should ask TransTech for more details, he made some qtwrt web apps.
More info:
http://talk.maemo.org/showthread.php?t=84023
http://xizhizhu.blogspot.com/2010/08...ello-view.html
http://www.maemonokian900.com/maemo-...ed-with-qtwrt/
Here some meego docs:
http://wiki.meego.com/SDK/Docs/1.1/Web_SDK_with_WRT

In the last link's the SDK, in which there's the Simulator I was trying out to test whether Mojo apps would run cleanly.

PS. If you (or someone else) would like to help me & TransTech in making WebOS mojo apps run on Maemo, just PM/mail me <marmistrz@linux.pl>