What does refund delayed, irs ref # 1201 mean?

i e-filed my return on 2-26-07, after a week irs website said i should get refund around 3-13-07. a few days after that it changed and is now saying delay in processing and gives ref.#1201. i lost my job of 16 yrs. last march, drew unemployment for a month then started cleaning homes in may. i filed married filling jointly, showed income from all sources, took deduction of using my car for cleaning jobs and took credit for my husbands 401k. i made est. tax pymts. for june, sept. & jan. so i wouldn't owe anything. help!