Memory leak in IE 7, 8 and 9 

Knockout: 2.1.0 and 2.2.1
Browsers: IE7, IE8 and IE9 

I think this happens in Firefox 19 too, though it does reclaim some memory back.

This fiddle http://jsfiddle.net/sGDpb/ demonstrates the leak.

Steps
1- click Create Items and note memory usage
2- click Create Items a couple of times and note memory usage increase
3- wait some time for GC to run, memory will not be reclaimed