I think somewhere in the rest of this season, we'll get a little more insight into how the Others are able to get off the island. I've got a pretty good theory on that (take a look at the Orchid orientation vid from the S3 DVDs if you haven't).
We already know Hurley makes it back to the beach eventually and that he's sorry he went to the barracks in the first place, so it will be interesting to see how that pans out in the next few episodes.
On a side note, does anyone else have problems watching the streaming video from abc.com? My HD recording was filled with tons of dropouts so I tried watching the latest episode online. It was really choppy and I had to turn it off after a couple minutes.