We don't have support for Community edition 3.0 yet. You can find support for Community edition 2.x in MyEclipse
(currently not available in Blue). We will be adding support for WAS CE 3, but this is a few months out, to be available only in ME 10.5 or 11.
Instead of the community edition, you could try using the developer editions of both WAS 6.1 and 7 which are available free and can be used easily for your testing purposes.