I'd like to have a

Get Home with public transportation widget. First of all, the user would enter the location (adress) of user's home. This info would then be stored in the widget. When started the widget would get the GPS data and feed the users current location to a web service (provided by the public transport authorities of the city in which the user lives) which would then suggest a public transportation method to go home. (For example, I live in Helsinki and the site to get the traffic info is http://aikataulut.ytv.fi/reittiopas/en/ I am sure that all the major cities have similar web sites).

Well, why the widget and not just use the web service directly with the browser? Because sometimes you might not know where you are and also not be in a condition to write the two addresses...