Thanks Shanghaiski, Seraphim98 and JamesR for your suggestions.
Shanghaiski - thanks for that. My priest is readily contactable by email and phone. However, he's very busy at present and doesn't really have time to answer questions that require detailed or lengthy answers, so that might not be the best way to conduct a catechism at this point in time.
Seraphim98 - I think I'm after something along the lines of what your priest took you through (for the theory side, anyway). Can I ask what readings your priest assigned you? Wow, 1600 miles away, that's exceptional...I imagine it would've required considerable effort, planning and flexibility on yours and the priest's part. Two hours is still a considerable distance, but pales in comparison to 1600 miles.
My parish is three hours away and I get there roughly every 2 months, so the situation is not so extreme. However, I'm not going through any formal or structured form of catechesis. Up to this point, most of my 'learning' has consisted of reading any books I can get my hands on, attending DL, OC.net, and asking the priest questions as I think of them. The lack of structure and grounding in the basics (Orthodox theology, life and practice) is starting to tell, though...I haven't retained much of what I did read months ago (unfortunately I did not take notes as I read, and I no longer have the books to refer to), not sure how to answer questions about or defend Orthodoxy when questioned/grilled by local Protestant Christians, or how to live and deal with current life issues in an Orthodox way. I'd like to start doing things a little differently, so will be in touch with my priest soon to see if we can work something out.
JamesR...my priest is definitely none of those things, but thanks for the (possibly unintended) humour - it gave me a laugh and a bit of light relief never goes astray!
Skyping could work, we've had a few discussions that way...possibly if he sent me reading material by email, I work through it in my own time, return any assignments or set work by email, and conduct any follow up discussion by Skype.
Thanks for the suggestions guys, you've given me a few more ideas to run by the priest. If anyone has other ideas, please throw them this way!