I came across this blog posting yesterday when trying to catch up on all of my rss feeds and thought it was worth posting as sometimes trying to find a SCOM Management Pack or Opalis (Orchestrator) Integration Pack can be difficult.
The author of the blog has compiled a list of hardware and software vendors that supply SCOM and Opalis (Orchestrator) MP's and IP's and it could be a useful tool when trying to locate that hard-to-find Management Pack.
Update Jan 2013: I'm updating the link below to reflect some updates by the author and a new link
Here is the link to the 'Unofficial' System Center Management Pack Catalog:
Microsoft have just revamped their Pinpoint website to make it much easier to find the Management Pack that you need - the previous implementation looked good but was much harder to find the MP you were looking for and a lot of the 3rd party MP links were outdated too with older Management Packs of no use.
The link to the new Microsoft Pinpoint website is below: