I'm a Jdownloader user as well, but with Firefox -> view selection source, I can copy a section of links to the clipboard...Rdesc automatically parses the clipboard and pops up the links, saving a couple of mouse clicks (Jdownloader requires you to manually add the links). It a minor quibble, but it's the reason that I always try to use Rdesc first for common sites (rapidshare, hotfile, megaupload). For other sites, I go straight to Jdownloader where I'm more sure of support for the site.
JDownloader monitors the clipboard as well. I use it that way normally to copy big batches of links and they show up in JDownloader's Linkgrabber immediately. Make sure you've got the button for clipboard monitoring selected on the toolbar (It looks like a clipboard.) The only problem I've ever had with it is that is an occasional file will fail a CRC check, but one of the suggestions on the forum was to set maximum connections to 1 (in the bottom bar), which I've done, and it hasn't happened since.
Another thing I particularly like about it is that when there are mirrors of the same file (i.e. the same file on rapidshare, hotfile, and megaupload), you just copy all of them to the clipboard and it automatically recognizes this and will download part1 from rapidshare, part2 from megaupload, and part3 from hotfile simultaneously. Haven't tested this yet with RDesc. Some hosts are better than others, unless you have paid accounts with them. Megaupload is fast and allows a lot of downloading before making you take a break. Hotfile and others have unbreakable (so far) captchas, so you have to type them in manually whenever their turn comes in the download list.
It also automatically extracts RAR files, even password protected ones if you enter the password when you set a container to downloading, and even extracts RAR files
within RAR files, if there are any.
For the case where there's links instead of plain text and the anchor text is not the URL, faster than going to the page source is to use the Firefox addon
Multi Links to copy the URLs to the clipboard by dragging a selection rectangle around them on the page itself.