Lima Sky, it should be noted, does not have the rights to the word "doodle," but rather just trademarks for the full title "Doodle Jump" and its central character's design. Bryan Duke of Acceleroto (Doodle Hockey) is attempting to rally other doodlin' devs not to kowtow to Apple and Lima Sky, saying "If we all stand together on this, the little guy won't be so little. I'm fighting this. You should too."
You'd have to be pretty naive to think many of these devs aren't trying to piggyback off of Doodle Jump's success, but it's a tricky legal area with such a common word as "doodle." Our advice? Next time, stick a "Q" in there somewhere.