The preprint server at Los Alamos http://xxx.lanl.gov is perhaps the most popular and useful source of current preprints in mathematics, with archives going all the way back to 1992. It also incorporates the entire MSRI preprint series. There is a "front end" to the preprint server which has a friendlier interface to use.

You can get on the mailing list for the classical analysis server (or any other list on the site) by the following simple steps:

This list will update you about once a week on what new preprints in the field of classical analysis have been submitted to the site. I plan to submit nearly all my preprints to this server, and hope others will do so too. (Submission is a little trickier than retreiving preprints or getting on the mailing list, but once you do it once, it's easy. Instructions can be found here.)

To unsubscribe to the list, repeat the above steps, but enter "del Classical Analysis" instead of "add Classical Analysis".

You can also submit papers to the archive. The first thing you need to do is register yourself. The directions are at

http://xxx.lanl.gov/help/registerhelp

Once registered, go to

http://arxiv.org/submit

to upload a paper. (This page is if you only want to upload one file. If you want to upload multiple files, you either need to "tar" the files into one single file, or have multiple upload windows. See http://www.arxiv.org/help ).

Further help on how to replace papers, withdraw papers, etc. can be found at http://www.arxiv.org/help .