I've been thinking about correspondence, both the source of XP and the actual letters posted in that thread over there. I'd like Tranquillina to be corresponding pretty much constantly (I'll say more about that in a bit) and perhaps some of you would like this opportunity too. I know this isn't the first time this has come up, but the effort seems to be on hold at the moment.
The main obstacle seems to be that it's a rather overwhelming chore for Jonathan to write all the response letters. On the other hand, there are clearly a bunch of eager roleplayers in the saga who would probably enjoy putting themselves inside another character's mind without any pressure on the outcome! Soooo ... I propose that we set up a system where gaining correspondence XP means writing letters from our magi, and also responding to those letters written by other players.
For example, if I want Tranquillina to do a whole bunch of correspondence, I post a list of which NPC magi I would like to write and how many letters (over, say, the period until the 1227 Tribunal, or some reasonable chunk of time). For each NPC, I provide (on the character sketches wiki page, say) a brief description of their reputation, strengths, and interests, and also where they live, when they met Tranquillina, how their relationship has been, and when they started corresponding (if it was before Tranquillina entered play); this would be like one paragraph total for each such NPC correspondent. Then other players in our saga can sign up to be that NPC, committing to answer however many letters was listed (and I do the same for other players' NPC correspondents). We're all honorable folks, so we can self-confirm that we've written enough PC and NPC letters to count correspondence experience for our magi.
There are a few details that could easily be worked out. Where do we post these NPC letter lists and claim them from other people's lists? - a Google doc spreadsheet would work, even if every PC magus wanted correspondence every season (unlikely). I think Jonathan endorses and would enjoy this effort on our part; certainly he seems willing to take a few characters to help out (people like Ra'am and Prospero at the very least). We might have to then adjust how many NPC letters are required, since there wouldn't be "enough to go around"; perhaps 4 PC to 3 NPC letters is enough to earn 4 Correspondence XP, or whatever ends up working.
I'm happy to organize the tracking of this information. For now, I'm hoping you'll just post a reply here, saying how much you'd be interested in such a scheme. For example, would you want your magus/maga to write a letter once in a blue moon? About one letter a year? About one letter a season? To start, I'm putting Tranquilling squarely in the "want to write once a season" category. Here are some reasons, if you're curious:
Of course more XP is always fun, although I probably won't be pegged as a munchkin by going after 1 XP chunks. 
Partially I'm motivated by bookkeeping: a season of study leaves me 3 XP short in some Art, say, and I like being able to round that up with Correspondence. Partially I just like keeping busy with my participation in sagas; it gives me something to do in the occasional lulls in posting. And partially it really fits the social and Intrigue sides of Tranquillina's character: she just really would be writing letters all the time, and I've privately resolved to make at least 1 letter per game year an Intrigue letter. And of course, fleshing out the game world and our interactions with it is always its own reward - that's why we're here, after all. 
(but you can agree or dis- with the answer).