MDownloader is a tiny program for downloading files available at the most popular file hosting servers such as Rapidshare, Megaupload and others. When downloading files, it allows you to queue the files you want to download and forget about them, thus removing the need of any human intervention.
After you add a link, MDownloader automatically check if the file is available or not, then it waits for the wait-time to lapse. It then recognizes and enters the CAPTCHA automatically and downloads the files for you. It even supports download resuming for those file hosting services that support it.
MDownloader also offers the option to do multiple simultaneous uploads to file hosting services.