Great thread!
I really want to write a long post on this topic because it really gets at the
one of the largest reasons behind why I started this site. The differences between Atheists and Agnostics need to be addressed and the Atheists affinity for quickly dismissing Agnostics as cowards who won't take a stand. But I've got to go to lunch so I'll make this quick
A seldom brought up fact is that atheists are just as afraid of being wrong as fundamentalists. They're just a little more vocal (sometimes a bit more rude) when it comes to defending their position and if labeling agnostics as cowards or people that have accepted a false label helps their cause they will use that.
Yes it's true some "self titled" agnostics latch on to that label because they are afraid to carry the stigma of being an atheist. But those are not true agnostics. They're atheists afraid to be atheists. They are no more a true agnostic than an agnostic who really doesn't agree with everything atheists believe but still calls him or herself an atheist is a true atheist. In every group there will be flip floppers.
Truth is agnostics are not afraid to admit they don't believe in God, they're just brave enough to admit to themselves and others that they don't know. God absolutely could exist it's just that most agnostics believe that if he does it's probably not in the way any of the religious beliefs believe he does. In other words they're all probably wrong and need to admit they don't know too

I personally don't believe in all that heaven or hell stuff, I just don't believe all this got here by itself. I also don't believe in the word "supernatural". I just believe it's just another word for something we don't understand. God is probably just a being (or group of them) that knows natural law a heck of a lot better than we do. God could even have existed in the past and no longer exists today. Who knows.
Ok this is getting long, ending now....