flashget is the most powerful, it has more features than getright. it allows great integration with netscape or internet explorer by allowing you to download all links by the filetype you choose. for example if a webpage has hundreds of links to larger pictures, programs you can specify flahget to get all .EXE, and .JPEG links off that page.
flashget also has a batch download feature. you can speficy say:
and specify numbers 123-486 in place of *** it will get all files withing those numbers. it will also use ordered letters also. if in doubt get trial versions of flashget and getright and test yourself.