If you are using a rapidshare to download some information then you are limited to download only 1 file at one time with very low speed of download. This is because they want all their users to upgrade their accounts to Premium Account where you can have parallel downloads.
Thanks to RapidShare Download Accelerator tool from themoviefind which is a standalone application, free for download allowing you to add multiple files at the same time and start downloading them. You can even move the added files up and down from the queue. I guess this tool can save up your money too because now you wont need to pay rapidshare any money for getting a premium account for parallel files download.