When logged into the mobl site, there is a new location button. If you click it, and are using a mobile phone that supplies location data, it will go ahead and load your location into a blog and let you type the title to publish.
You can also just click the location button on the regular mobl publisher
And from the non mobile site publisher for those using it on mobile devices or devices with accurate geolocation like a netbook or ipad.
Unlike facebook, everything on estrip is public so think about that before you publish something you don't want people to know about.
I'll make it do some fancier stuff when I have some more free time. I wanted to do this for years but everyone always thought it was so creepy. Now its practically mundane.
I thought if you collected it all you could start forecasting social occurances like weather. e.g. there is a 40% chance of someone from your social group eating at panos next tuesday, etc. I am sure the folks at facebook and foursquare are already developing that. It must be nice to have so much data to mine.