Here is a collection of Omniture SiteCatalyst plugins that I have found to be pretty useful. The documentation should be pretty straight forward. If there are any questions please feel free to contact me with any questions you may have.
Remember, use these at your own risk! These are a few I found by just searching in Google. Make sure you fully test them in your development environment before using them on a live site. If for some reason they do not work, calling Omniture Client Care probably will not help with these!
Append to List
Detect Rich Internet Applications – Flash and Silverlight Versions
Get Cart Open
Get Folder Name
Get Val Once
Get Visit Start
Persist Value
Query Param
Reset Get Cart Open
Time Parting
Visit Number
Popularity: 16% [?]
