I am a big fan of Gmail. Rich bailed on Gmail because he thought they lost one of his emails. He is now using Hotmail. But, Gmail continues to rule the roost and I think it is a great email client and service. But, Gmail is not without some annoyances. Some of those annoyances are big and would need to be solved by Gmail themselves (such as the addition of a to-do list). Others are small but can be fixed using Greasemonkey.