Android’s gaining a head of steam as it heads towards release — Google just posted up some details on the upstart OS’s app distribution system, Android Market. Just like Apple’s iPhone App Store, Android Market will run on Android phones like the HTC Dream and allow users to browse and install apps, as well as comment on and rate apps they’ve already purchased. (Somewhat terrifyingly, Google describes the rating and comment-system as “similar to YouTube,” but we’re hoping the reference is to user-generated ratings in general and not the grammar and language catastrophe that is YouTube comments.) Unlike Apple’s store, however, Android Market will be open to all — Google wants devs to “have an open and unobstructed environment” for their apps, and it’ll only take three steps (register, upload, describe) to put content on the service. The first Android handsets will come with a beta version of Market that supports free downloads only, but a version that has app sales, versioning, and other features will arrive soon after launch — given the number of mediocre apps that have somehow passed Apple’s vetting process, it’ll be interesting to see what shows up in Google’s store with no filters at all. More screenshots after the break.