Persisting the information throughout various sessions is definitely something that sounds easier than it really is. Since you're a programmer, you might be able to take a look at it and make something work -- you may not know, but LimeWire is completely open source (that's actually how I started my involvement, by adding the 'time' column to downloads as an open sourcer). Check out www.limewire.org for more information (such as how to access our CVS repository and how to join mailing lists, etc..).

You already can sort the files via hits or uploads just by clicking on the column you'd like to sort. This works best if all your shared files are in the same folder, and doesn't work so well otherwise ...

Thanks.