As more and more companies get past the pilot stage with their SharePoint 2007 deployments and start broad roll-outs in early 2008, there will likely be a significant increase in the need to integrate SharePoint with other portals and applications.
I was just about to draft a blog entry, outlining the various integration options provided by SharePoint, when a few people pointed out to me that there was already an excellent post by Jose Barreto, who was an Enterprise Systems Architect prior to taking his current role as Technical Evangelist for the Microsoft Storage Partners Team. Although you can find some fairly useful content by doing a search for "sharepoint integration" or visiting our Interoperability Center for MOSS 2007, I like the way that Jose has laid out all of the integration options in a logical and succinct fashion in his blog entry, which he has given me permission to repost in its entirety below.
Source : Microsoft SharePoint Products and Technologies Team Blog