I thought this was pretty cool: ToTheCell.com - Quick, easy, free cell phone reminders. It's a free web-based service where you type in your cell phone number (or someone else's, I suppose, too), a message, and a time and date, and the message is delivered as a text message at the time you specify.

I know that I can set an alarm on my phone, but in order to do that, you have to find a day on the calendar, set a task, then set an alarm, and it's kind of a pain to do. Also, typing in a lengthy list on the phone keypad is time-consuming.

I sent myself a message this morning to remind me to do something after I got to work; I can also envision sending a shopping list or something like that -- again, I could type it in as a "note" in my phone, but as long as I'm in front of a full-sized keyboard, I might as well take advantage of it.

Link from textually.org.