This pipe aggregates craigslist feeds from the New York Metro area. Enter the code for the category you are looking for (defaults to bikes). Here are some other categories: Cars = car, Motorcycles = mcy, Free = zip. You can find other category codes by visiting http://craigslist.com. The code is the last three letters of the URL.
Pipe Web Address: http://pipes.yahoo.com/pipes/pipe.info?_id=wv_18wa62xGiD_iRe_gC8A