Daniel Read has a nice blog and is starting to blog a bit about Integration Services.
Catch the main blog here:
http://www.developerdotstar.com/community/
And the SSIS related blogs here:
http://www.developerdotstar.com/community/taxonomy/term/58
Dan seems to be digging down into the bowls of IS and finding some interesting things.
Take a look.
Universe.Earth.Software.Microsoft.SQLServer.IS.KirkHaselden