This chrome plugin is still my favorite way for sideloading apps on BlackBerry 10. The PlayBook App Manager extension for Chrome received an update this week which seems to have changed its name and added a few bug fixes in v2.1.0. It is now called the BB10 / PlayBook App Manager which makes more sense. No word on what else is new but let us know if you spot anything.
You can find the update in Chrome Webstore here. Thanks Phil for reminding me about the update! I forgot about it.