How to deploy SSRS reports build through Report Builder?
With RB (and sufficient privilege), users can save reports straight to the Report Manager environment. At that point, they're deployed. But if you want to have them save those reports to a Dev/Test box, and want to push them live, there's a few options.

One easy option is to move reports into a known folder 'For Deployment'. You can then have a script which grabs the RDL for reports in here and uploads them to the proper server. You'll probably want to make sure the data sources are mapped appropriately as this method can annoyingly lose references. You can use rs.exe for your scripts, or just use the web references. PowerShell can be very useful here, as it happily talks WebService, and you can schedule PowerShell scripts using SQL Agent jobs.