I've opened another thread about jQuery 1.5.0 vs IE9 here: http://www.oxwall.org/forum/topic/1377
I've done it because I believe it should be tested most extensively before anyone can claim that jQuery 1.6.1 will damage some plugins. In fact, I have a OxWall 1.1.1 installation running with jQuery 1.6.1 in http://www.friendlyground.com
and so far I haven't identified any issue whatsoever in any functionality of any plugin (I have almost all of them installed). Of course that I am only one for testings, and that's why I am calling for others who may want to try it. After all, you don't want your site to look bad in IE9, do you?
In the aforementioned thread I've added a quick and easy (and more than obvious) method for anyone to make the OxWall installation use the jQuery 1.6.1 instead of 1.5.0 without changing one simple line of code anywhere.
Read the post and help if you can. Lots of IE9 users will now be able to use your OxWall site as well.