Anyone know of a good way to get from Tel aviv airport to Jerusalem? Anyone know of taxi service and how much they charge? Maybe there's a train?
Depending on how much luggage you have and how much you want to spend:
Shuttle (Nesher):+972-2-625-7227: ~65 NIS, door to door. They have shuttles once per hour. You must reserve (expect horrible CS even on Israeli standards). Good idea to reserve to get there an hour earlier than you usually do.
Cab: Try Hadaka 99: +972-2-500-0787. Price ranges ~150+ depending on how many people. Reserve beforehand and make a price.
Bus: From Central Bus Station, take Egged 947, get off at tzomet EL-AL, then take free connecting bus to the terminals.
Train: Only sensible from Tel Aviv or Modiin.
Bus/Train: Take Kavim line 110 from Sarei Yisrael / Yirmiyahu/ Golda to Modiin Train station, then take the train to Ben Gurion terminal 3.
You can also wait like five years for Israel Railways to open up the new Jerusalem CBS - Ben Gurion - Tel Aviv route which will get you to the airport in 25 min.