The US Mint is releasing 50 special quarters over a 10 year period to mark each state's admission to the Union, a new one is released every 10 weeks.

So far they're up to 2005, about halfway through the 50.

When checking through my change when I got to the States 2 weeks ago I realised I already had a few of them, and decided I wanted to collect the set. I managed to get a good selection from Bonita, and collected a few more while I was staying there.

Out of those already released, I only need a couple... and I will update this list as I get my hands on them:

1999
Delaware

2000
Massachusetts

2001
Rhode Island

2002
Louisiana
Mississippi

2003
Alabama
Maine

2004
Wisconsin

2005
Kansas
West Virginia

2006
Nevada
Colorado
North Dakota
South Dakota

2007
Montana
Washington
Idaho
Wyoming
Utah

2008
Oklahoma
New Mexico
Arizona
Alaska
Hawaii