Internet Explorer
9.0 - Full support.
8.0 - Full support/visual fidelity limitations.
7.0 - Functional support/visual fidelity limitations.
6.0 - Functional support/No Visual Parity. Support is being phased out.  PC-Only
5.0 - Not supported.

Mozilla Firefox
4.0.1 - Full support.
3.6.15 - Full support/Sunsetting.
3.5 - Functional support/Sunsetting.
3.0 - Functional support.
2.0 - Not Supported.

Apple Safari
5.05 - Full support.
4.04 - Full support. oSx-Only
3.0 - Functional Support/Visual Parity. oSx-Only

Google Chrome
Chrome 12 – Functional/limited support. Should closely echo Firefox 4.
3.0.195 - Moderate Support.  Currently Under Review. PC/oSx (beta)

Opera
10.10 - No Support.