tvtome.com has the synopses of the next two episodes on their web site. Just so no one who wants to avoid spoilers gets spoiled, I'm not going to copy and paste them here. The link will take you right to their page on Lost. I'll just say that the one for the 19th looks to be interesting.
I wonder if the producers have things planned out and this will be a finite series, like was done with Babylon 5, and will come to a conclusion after 3-4 seasons. In this day where TV shows see high sales on DVD, it's entirely possible. Personally I'm finding the ride to be a great one.