I have finished setting it up and testing it, and all i have to say is the following:
GREAT JOB FLAPS!!!
lol, I'm a total linux noob, but following the wiki step-by-step, I installed it and configured it, and got it working on my very first try

I am in Montreal, Canada and use Rogers Wireless as provider. I had to edit the wiki page you had posted in the first link because some information were not properly enter, but from now on, any Rogers user in Canada can copy it word by word and it should be 100% fonctional.

A little fyi... I don't know if it's the same for other (american) providers, but I called up Rogers and spoke to 2 different technical support agents, and they told me (althought they admitted they weren't sure) that Rogers does NOT use a size limitation on MMS but that it all depends on the receiving phone. After thanking them and hanging up, I took a full 5mp picture, and used the FULL size of 2576 width, although it took about an entire minute to "convert" it, my gf received the full picture
So once again, thanks for the amazing job

(Two little sidenotes... it might be just me, but it seems like staying connected to the APN and the sending of MMS drains a lot of battery. And I lost access to my MicroSD card... had to restart to regain acces to it)