In addition to the other requested Cisco devices on the forum, I think Cisco wireless controllers would be great to collect syslogs for as well!
A content pack analysic netflow traffic from different sources
We are looking for Content pack for Cisco IronPorts, is that something available today or in future?
Analyzing the weather with Log Insight: http://sflanders.net/2013/11/18/analyzing-weather-log-insight/
Community content pack done by: http://velemental.com/2013/08/22/emc-avamar-with-vcenter-log-insight/
The Content Pack can be downloaded from here: http://velemental.com/?attachment_id=1200