I'm looking for the latest, stable version of Ubuntu that uses Gnome 2. As much as I understand, newest, stable version - 11.04 - is using Unity... and that's new desktop environment.
Is Unity a Desktop Environment? helped a lot.
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Ubuntu 11.04 is the latest version that uses Gnome 2 (Although this isn't exactly what you want, as you actually are talking about gnome-panel, which 11.04 uses Unity), but this version is no longer supported.
Ubuntu 10.10 is the latest version that uses gnome-panel by default, but this version is no longer supported.
Ubuntu 10.04.2 is the latest LTS release that uses gnome-panel, which is supported until April 2013 (for the Desktop) and April 2015 (for the server)
You can have the classic look by doing this:
you can have 12.04 with Gnome2, here my: