I have my own webserver and am running apache on it through linux (kubuntu). I wanted to know if there was some kind of applet or program that i can incorporate into my website so that i could choose a file off my computer and upload it to the website, and then have that file be downloadable through the website automatically because of the upload (as in a link or something is shown to it). What i'm trying to do is similar to what photobucket has with its interface and uploading pictures. Is there a place i can get this interface? I'm not sure where to start really and would appreciate any help.

You can start by doing a web search, I'm fairly sure there are numerous such programs - written in php, for example. Depending on how complicated you want it to be, you could possibly write such a php script yourself (possibly including database usage, which might make it easier to maintain); the troublematic part in that is making it "secure", so that people can't start misusing it right away without any trouble (at all, if that was possible, but most of the time it's not).

Try searching for "php file upload script" for a start - you'll get a lot of answers I can imagine, but see if there are any that sound promising, or maybe better keywords.

How about implementing an ftp server within apache?

http://mina.apache.org/ftpserver.html

Hope this helps.