I said above I haven't heard this usage, and the following from Encarta seems, like Jackie's post and some others above, to confirm that it is a US thing but gives a bit more detail on geography of where it is used:

anymore or any more?

The adverbs any more (written as two words) and anymore (written as one word) are equally standard in American English and some other varieties (for example, South African English) Both forms are used after a negative or a question: She doesn’t live here anymore. Do you eat out any more?

Regional History

Used in the positive sense, “nowadays,” as in asparagus is expensive anymore, anymore recurs over much of the United States. It is strongest in the South Midland states of Kentucky and Indiana, but is also fairly common in the Upper and Lower Midwest, from Minnesota to Oklahoma, and in the Blue Ridge region of Virginia.

So there we are, it is used in the US, but doesn't seem to have fully spread out to the coasts yet!