Not exactly as you described, but....
http://www.wowinterface.com/download...fo.php?id=5643
Something I wrote and my guild has been using for ... I dunno, about a year, for keeping up with our blessings. It doesn't handle Seals / Judgements, but we typically only have been keeping up Light and Wisdom in our guild, so it wasn't a really big deal.
There's also a few more screenshots at the bottom of this page, including stuff I'm working on improving for the expansion.
http://elayneff.wowinterface.com/por...189&pageid=101
There's a lot of information to sort through, but basically it has a checkbox for each blessing for each class (since obviously you wouldn't want to have Salvation on Warriors all the time, you could assign the Salvation Pally to do other stuff--say, Might, where you wouldn't need Might on casters).
Assuming the other Paladins are using the mod, it also tells the leader who has which improved blessings via Talents and AQ20-spell ranks. Once the other Paladins accept the leader's broadcast, it creates a button for each person in the raid and puts it positioned near the CTRA window for that person, that, when clicked, will cast the blessing on the person, and then hide until the buff wears off. (So, easier to keep track of who is missing your assigned buff as well.)
Anyway... if that's not something you're interested in, well ... doesn't hurt my feelings. :P