Macworld We just found an amazing discount for the excellent Logitech K585 multi-device keyboard, which may very well be the perfect solution to your multitasking needs. Now available for $31, down from the regular $50, the keyboard is very close to its best price ever. Picture this – you’re working on your MacBook, and you suddenly need a second screen, so you pull out your iPad. You connect the two devices, place the iPad in the K585’s slot, and start typing on the keyboard. As the keyboard is connected to both your iPad and the MacBook, you can just press a button and swap from one device t…