I came across a new email client for Mac: Sparrow
Sparrow is in beta (v6) and it is free. It works with Google and Google apps, and the advantages that has over Mac Mail is that you can archive and see labels, pretty much like you see it in the web, with conversations, etc….
It is beautiful, nicely design and it works fine. Every day there are more Google mail users using mac, and this is the perfect client for them.
I am one of those. I use mail from mac with 3 accounts (all google apps: norai.net, tokao.com and torres.cc).
I also have Outlook 2011 for work (ifrc.org) which is great for exchange and having corporate LDAP and Pushed calendar and email.