For some reason, the PlaceFinder API (and also Yahoo! Maps) has problems locating and plotting addresses in Alphabet City--the slice of Manhattan from Avenue A to Avenue D.
This address fails: 133 Avenue D, New York, NY
However, this one plots correctly: 133 Avenue D,10009
Similarly, addresses often fail if the ordinal suffix (st, nd, th) is left off... 123 1st Avenue, New York, NY works, but 123 1 Avenue, NY,NY often doesn't. The same problem affects 2nd Avenue and others.