I have written several times about my workflows for facebook, twitter using brightkite, one of my favourite apps.
Now with all the location-based apps there is a clear hype, but again we will start experiencing fatigue. You go to a bar and then what… you have to open brightkite, check in write a note and maybe take a photo so you share it in facebook and twitter, then foursquare and you see if someone is there, add a tip or a todo and maybe get a mayor, and then gowalla… uffff
Like pixelpipe allows you to post to all social networks. I use it to upload the photos I take to several locations at once (my server, flickr, youtube (if it is a video), expono…, check.in does the same for your location-based apps.
It is done by the guys of Brightkite so it should be good.
Check.in is an application that lets you check-in with multiple services at the same time. For the time being by invitation only.