Best Buy makes its idea-gathering application engine free and open source.
bbyidx.com
bbyidx.com
Hence, if you take a look, the top three items there were submitted 3 months, 4 months, and one year ago, respectively. That might work for Best Buy's intentions, but generally that wouldn't make for a very sticky/relevant site. Would really like to see them incorporate date of submission into rankings.
So to remain at the top, an idea has to keep getting new votes _from new users_.
The ideas at the top of the list have been there for a long time because they're good ideas, and they having staying power.
(Note that you can change the vote decay rate depending on whether your site is more interested in what's hot now, or what's popular over the long term.)
http://teddziuba.com/2010/01/i-love-the-gpl-except-when-it.h...
From there on you only need to care about mercurial if you plan on committing stuff, etc.
"BBYIDX is a free and open source idea-gathering application written in Ruby and distributed under the GNU Affero General Public License. It's the basis of the Best Buy IdeaX website and was created by and supported by Best Buy Enterprise Services Inc and Bust Out Solutions, Inc. The standard release is known as BBYIDX and features the ability for users to simply post, tag, comment and vote on ideas. It also features the ability for administrators to moderate incoming ideas and comments as well as assign work-flow to certain ideas for further exploration. It also offers the ability to group ideas by "current" or category to create new "currents" which serve as problems or issues to be solved by comments and moderation. It also features read and write APIs that can be used to make access to an instance of BBYIDX via another website or mobile application."