Darn near everyone has email these days. Use email to organize your group.
A few days before your game, send out a reminder message. Remind everyone of the time and place of the game. Ask people to confirm that they'll be there so you'll be able to plan for any missing people. If there are special details for this game session ("Bring $20 for the pizza fund"), this is the spot for them. If you run a regular game and need to cancel a session ("No game this week while I'm on vacation"), you can easily communicate it here. All of this is even easier if you have a mailing list.
While you're sending out the message, provide a two or three sentence summary of what happened last week. "Last week the group left town to defeat the dragon. While climbing the mountain to the dragon's lair, the group barely fought off some griffins. Now the group stands at the entrance to the dragon's cave." The reminder will get people excited for the next game and get them planning their actions. A collection of these summaries can form a brief history of the campaign to reminisce over.
It can be handy to have a dedicated email list for your group. It gives you a handy place to send your reminder messages to. Many are archived automatically, so players can review the old messages. Players can also chat about recent game events and plan for the next session. You can set up a free mailing list at Google Groups, Yahoo Groups, and elsewhere.
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