I have no affiliation with DZone. I enjoy the site and have received a substantial amount of traffic from there.
They have a variety of free "RefCardz": reference PDFs on various subjects.
And, now, there is one for Groovy! I can't resist reference stuff like this. Check it out here if you are interested. It is free, though registration is required (including address and phone number, unfortunately).
Other subjects include Eclipse and Idea.
there's another Groovy refcard at docs.huihoo.com/groovy/groovy-1.0-b7-reference-card.pdf. Not as detailed but covers the basics and no registration. - Peter Buck
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