If you have several gmail accounts, and wanted to run several mobile gmail apps on your java enabled mobile phone, you probably ran into trouble when trying to install more than one gmail.jar into your phone. Java doesn't allow multiple instances of the same program on Sony Ericsson phones. I edited program name in java manifesto to circumvent this restriction.
You can find v1.1.1 (generic MIDP2) gmail2 and gmail3 here http://rapidshare.com/files/40491513/gmail23.zip.html
I tested it on SE K610. Please comment how it works for you.