With YouPosition.it you can very easily create an online logbook of your trips, just by sending SMSs with your cell phone. Now you can also send positions via email. See instructions below.
If you include in the SMS the coordinates of your position (latitude and longitude read from a GPS or a Navigator like TomTom or others), your message will be displayed on Google Maps, so your friends will know where you were when you sent the message.
It's much the same as writing on your own blog, but here your messages are also geo-localized
Registered users can also write comments to your posts, and you can answer to them.
Later, when you're at home and you have an internet connection, you can also upload a picture for each message that you sent.
If you want to see an example now, you can view the last received SMS.