Are you ready for another PC on a stick? Lenovo this week joined a handful of companies that have come out with this concept by releasing the Ideacentre Stick 300. The portable gadget works with any HDMI-compatible device, which means it can be plugged it into a flat-screen TV -- or provide ultra-portable computing Set to hit retail shelves in early July, the Ideacentre is a late entry among super-portable PCs.