I'm another of those with a Korean wife. Have been far-too-casually studying on and off for the last 6 years or so. Am trying to study a bit harder this year to get out of the low-intermediate rut I'm in and get to a more conversational level My mother-in-law is very disappointed I'm not fluent yet, but getting vocab to stick is hard as my wife doesn't mix with Koreans a great deal, and at home, the topics I can listen to are not that broad.
Have only been to Korea once, late 2006 for five weeks where we had our second wedding in traditional Korean style. Had a great time and can't wait to go again, and am planning a walk/cycle tour in 2010. I noticed Junsoo talking about a Korean cycling trip in one of the podcasts, so maybe she can be pressed for more details at some time?