You always forget about things you have to do next moment?, visit Remindr, it is a simple service that offers different ways to get reminders for things you have to do.
Setting up reminders with Remindr is easy, no registrations and logins just visit remindr and enter the message. Then select the service you want to get reminder, supports twitter, email, im (via jabber/Gtalk) and phone. So you will never miss any important task.
This is good for one time reminders and offers a quick way to setup reminders. For serious task management visit rememberthemilk or use Gmail tasks.