I know this isn't exactly what you're asking for but Cisco has embedded Jabber into Finesse in version 12 of the server. There's also a pretty big UI refresh with version 12 along with a lot of new features. I'm guessing that the gadget has been pulled so that people are pushed to the newest version.
I'm not aware of Jabber itself being embedded into the Finesse desktop, but in Finesse 12.0, an agent can use Jabber as their phone device (where the call control controls that jabber phone) as well as do IM&P (Jabber) chat.
I haven't heard of anyone having a Jabber in Finesse gadget recently (pre 12.0). The sample gadget was pulled because it wasn't reliable and was causing more problems than it was worth. It was originally a hack day project so it wasn't nicely written and had lots of bugs.