I with the don't tell the land lord anything crowd. I gurantee if you tell the landlord, you'll have to buy new carpet. If you don't say anything they'll never even notice.
i suggest a heat lamp aimed at the carpet.
here's what we did:
we bought some of those cheap clip on shop lamps and put 1 reptile heat lamp in one, and in the other we put a compact fluorescent UV light. we aimed them both at the wet spot, and towelled/blow dried (with a hair dryer) repeatedly. its long and slow but it worked. the UV light will help to ward off any mold/mildew
hmm.. i noticed that you said you aimed it at the spot.. in my case the spot is about 12x5 in one room and about 12x2 in the adjacent room.. how big was yours? the lamps don't get THAT hot do they?