As the others have mentioned, FHA is generally the loan program with the lowest down payment still available (3.5% along with seller contributions of up to 6%). Most conventional programs now require at least 10% but there are a few out there that might do less, depending on the size of the loan and your financial position. Every bank has different programs so just check them out.
You need to contact a reputable mortgage professional (or several in order to get a broader view of what's available). I recommend you go with someone local (preferably someone who actually can do the underwriting locally too -- a lot of the big banks have their mortgages processed out of state). Suntrust has really good rates on conventional mortgages and they do their processing locally. They also have a wide range of loan products available. Talk to your agent as well as friends and family about referrals to good mortgage lenders/brokers. If you need a referral, I'd be happy to provide you with contact info for several excellent intown lenders.
Best of luck! This is an amazing time to buy! :D