In US series, this is not a big deal. Seinfeld had a Mac, Ted Mosby from How I Met Your Mother has an iMac since season one, Sex And The City's Pismo PowerBook, i.e. (Btw, Mythbusters are now sponsored by Microsoft, advertising Windows 7 and don't use Macs in the show anymore)
But you miss the point of significance, I'll lay it out for you: Traditionally, Germany (and likely the rest of the EU) is PC land. Macs were used only in the graphic designing, Audio/Video editing and DTP environment.
It means that Apple's Marketing has done a pretty good job changing the Mac from a high-end tool to average joe's browsing and spreadsheet machine, and that PCs loose market share in one of their core markets - they're becoming mainstream. As this is just starting, you can expect Apple to grow even further in Europe. I guess you can blame that completely on the iPhone and it's aggressive advertising, as iPods didn't affect Mac sales a lot.
Besides, this is a real life office in a newscast, not a TV show with placed ads, as this station is federal and by law not allowed to place ads in their shows at all. But you can see how impressing even they found an 27" iMac, as they did a whole sequence entirely showing the Mac with the guy entering in the background and start browsing.