Careers: Knock-knock jokes, a pair of them, play a supporting role in this Ask the headhunter post. Here’s one: “How long does it take to replace an engineer?” The theme, of course, is convincing workers to stick around. “Do the math. Retention and employee development are a good investment.” Storage: While conceding that it might “come closer than most to being the ideal gadget to take with you on the road,” Mario Apicella urges IT to proceed with caution when it comes to the iPhone. “If you’re a storage administrator, you might benefit from reluctance like mine because you can bank on your end-users bringing these little beauties into the workplace,” he writes. What, prey tell, does such resistance have to do with storage anyway? Well, it’s all about data protection. “An iPhone carrying sensitive files could easily be lost or stolen, landing your company’s name in the wrong section of the news. Are you ready to manage that risk?” Related: iPhone SIM works in any non-iPhone handset for calls, but not for data. Notes from the field: In the geek week in review, Robert X. reports that SAP got zapped, someone’s granny is packing heat on AOL’s new video site. “Meet the new AOL, lame as the old AOL.” What’s not so lame, perhaps, is that a PR officer at Roswell Air Base had some alien-related confessions held until after his death. And Cringe has some advice for Apple’s head honcho. “Take this, Jobs, and shove it.” Careers