Open source: The first of April, being on a Sunday this year, pretty much came and went quietly in the tech realm. But Dave Rosenberg uncovered one gag about Microsoft CEO Steve Ballmer joining the Linux Foundation’s board. Best of the blogs: Ed Foster, meanwhile, presents the Constitution of the United States of America, version 2.0. This iteration removes “those cumbersome checks and balances that just get in the way of effective government,” and won’t require “some drawn-out approval process by Congress and the states.” Oh yes, and if you’d rather opt-out, well then, just leave. Special report: As today marks the final print edition of InfoWorld — no, this is not an April Fools hoax — we’ve got a raft of stories, including this one that reports on the mixed reactions of readers to the news, five technologies that changed the publishing world, and Welcome, citizen journalist. The news beat: BEA Systems upgrades its WebLogic Server, with a focus on Java-based features, simpler development of applications and services. Tibco touts an open source toolkit for testing AJAX applications. Microsoft is scrambling to fix a flaw in the .ani Animated Cursor files through which more than 100 Web sites are serving up malware. And eEye Digital Security issues an unofficial patch to plug Windows zero-day hole. Software Development