tag management

When comes the tag (or labels / groups in GMail - did i forgot a name?) management application which can be integrated as components in SOA system?

Ok well according my one definition the internet is not SOA yet .. but will I expect it will be in the next years.

I just worked on the management on may tags on del.icio.us but my wiki does not support tags yet ( as far I know *g*) and there is not integration.

What I like to have (and not develop for my self .... *g*)
- One tag management application for all my accounts (even e.g. amazon, wiki, mail ...)
- a graphical tool to manage all tags
- automatic sync (e.g i tag my article here, then it is added automatic added to del.icio.us with the same tags - ok this is not a feature of a tag application :) )
- many ideas more ... :) - maybe I think about If i got payed :)