"The model that is quickly emerging as the de-facto model for location updates is the so called check-in model.
Contrary to the always-on, automatically updating friend tracking model used by services like Google Latitude and Loopt, that has been prophesized and expected to take off for years, the check-in model used by services such as Gowalla, Foursquare and MyTown lets a user manually and deliberately 'check in' to an exact/discrete location and actively update friends and others about it." – from here. Actually it is a really very interesting review.
Btw, one of the early check-in services was our mashup Geo SMS. Lets you check in via plain old SMS. See also its description here.
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