The theory behind the Technorati taggregation is great: see all posts with a tag on one page, aggregated from the blogosphere, Flickr, Furl and delicious.
The reality is that it is subject to the whims of Technorati indexing, which means that if Technorati indexes your site a lot, you end up looking like a taghog, while if Technorati doesn't pick up your site, it looks like you're excluded.
For example right now Technorati tag sla2005 shows loads of my posts, but none of the good new posts from the SLA PAM Division blog. There are similar problems with BlogDigger, which does not appear to have the DPAM blog in its index.
I guess this is one of the risks you're always stuck with when relying on third-party tools outside of your control.
In theory, if you ping Technorati, it's supposed to pick up your new postings in its next indexing sweep.
Until there's some more reliable way of getting tagged postings indexed quickly and reliably, I can see there's going to be a bit of taggravation.