AndyRossy on the forums here does bank transfer for BTC - tell him I sent you   
Not sure what the fees are currently but I think it depends on the order size...

If you're inside the US, the easiest/cheapest way is TangibleCryptography, as linked above, or Bitfloor.com

Both accept cash deposits at various banks (WF, Chase, BOA) that are credited close to instantly.

Tangible uses MtGox's exchange rate at time of deposit, sometimes with a discount. Bitfloor is a full exchange with an order book.

Both have excellent customer service.

Other services may charge exorbitant fees, so read the fine print before buying anywhere else.