With last week’s additions, RePEc is now carrying bibliographic data from over 1000 archives. This is a good opportunity to give a reminder how data actually makes it to RePEc. Indeed, there is no staff at RePEc that would be inputing data, this is all provided directly from the publishers. These, be it commercial publishers, Economics department, research centers or central banks, put files at a predetermined address on their web or ftp server, following the Guildford protocol. These files follow a set syntax codified by ReDIF (Research Documents Information Format). The RePEc services then gather this bibliographic data on a regular schedule (typically every night) and display it to the public.
Thus, if you are a publisher and want something listed on RePEc, follow our step-by-step instructions. If you are an author unhappy that some of your works are missing, encourage your publisher(s) to participate. Alternatively have your institutions participate with its working papers (most publishers allow pre-prints or post-prints to be posted) or load your works up at the Munich Personal RePEc Archive.
Update (March 13): We have now also supassed 2500 working paper series…
The RePEc Blog 
What’s your preferred method of gathering records if content was held in an Institutional Repository?
Institutional repository provide their metadata like any other RePEc archive, following these instructions. Of course, as they already have their data organized, it is just a matter of converting it to our format. For this, help is available, as discussed in this other blog post.