Though HP announced two desktops today, the most interesting tidbit might not be the computers, but the software installed on them. As the company releases new hardware, it's also rolling out a revamped version of its TouchSmart UI. Now called Magic Canvas, it'll work even on PCs without touchscreens, and it's going to ship on every HP tower and all-in-one, including already-announced models like this. The most significant improvement is that you can now access the Start Menu and all your Windows apps, even when you're imm
