Here's a useful page to keep an eye on: http://msdn2.microsoft.com/en-us/library/ms403408.aspx. It lists the current features within SSIS that will be disappearing in future versions and the strongest message I take from it is that you should upgrade your existing DTS packages from SSIS sooner rather than later.
Currently it also makes mention of the ActiveX Script Task and VSA (which runs the Script Task and the Script Component)
I would also highly recommend that you read this in conjunction with my colleague James Rowland-Jones' post entitled 08.04.08 is SQL2K day.
Incidentally, if you want to keep an eye on James' blog, my blog and all blogs by our Conchango colleagues then subscribe to this rss feed: http://blogs.conchango.com/MainFeed.aspx. If you're interested in what other things the Conchango brethren witter on about then check out the tag cloud.
-Jamie