Fortunately Konqueror has this cool embedded konsole window, so if all link addresses follow a special schema, you can do some magic with 'for i in 1 2 3 4 5; do wget http://host/doc$i.pdf; done'.
However not all professors name their documents by a special schema... so back to the 'Save link as...' solution? Not anymore! :)
I've written a plugin for Konqueror in KDE4, which allows you to select a couple of links on a website, choose a menu entry from the menu bar, selecting a destination folder and all links, independent of their names, will be downloaded. As pictures say more than 1000 words, here are the obligatory screenshots:
1) Select the links and choose 'Download selected Links...' from 'Tools' menu
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2) Select the target directory
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3) The download dialog will show the progress of the download
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If anyone is interested in this plugin, I would commit it to extragear/base during the next days.