Promoted build #9 for GlassFish 3.1.1 is available from the usual location. This is the "soft code freeze" build with only the "hard code freeze" build left before the release candidate. So if you have bugs you'd like to see fixed, voice your opinion *now*.

As a quick reminder, GlassFish offers Web Profile or Full Platform distributions in ZIP or installer flavors (some more details in this blog post from last year but still relevant). If you've installed previous promoted builds or simply have the "dev" repository defined, then the Update Center will simply update the existing installed bits.

In addition to the earlier update on 3.1.1 it's probably safe to say that this version was carefully designed to be highly compatible with the previous 3.x versions, thus leaving you with little reasons not to upgrade as soon as it comes out this summer.