I have updated my Hesk hack based on a request from a reader. You can view the new instructions or download the new files here: http://wiki.cornempire.net/hesk/hesk252
For those unaware, my previous post on this matter was here: http://cornempire.net/2010/07/31/hesk-enhancements-for-version-2-2/
2.5 introduced a lot of changes. One of the big ones that affected my hack was the ability to directly link to a category type. This is now built into the application, so I modified my hack to take advantage of this.
If you have any questions, let me know.