I thought it was somewhat clear that time passes slower on the island compared to time off the island.

The losties estimate they have been on the island for a little over 100 days.

1.When Sayid first sees Naomi's sat phone he says he has never seen technology like this before. Now maybe Sayid just wasn't aware of this technology, but I took it as a clue that that technological advances have been made since their "time" on the island. A 100 days would be that much time for technology to advance but if that 100 days on the island was equal to years off the island then it explains the sat phone.

2. When Kate's mom meets with Kate during her trial she says she has been fighting her cancer for the last four years. Now one of the first things Kate would have to do when getting off the island would be to stand trial, so I am assuming that the flash forward we saw in "eggtown" happened relatively soon after they got off the island. So does that mean that the last four years Kate's mom is talking about is the "time" that has gone by for the rest of the world since 815 crashed on the island?

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Doctor playing golf. Woo, boy howdy, now I've heard everything. What's next, cop eating a donut?