For guitar reference, here is a great guitar instructional on the song with an opening that is awesome to listen to over and over again, and Justin does a great job of explaining the main riff. Crank up your volume and bass to get the full effect!:
For vocal reference, check out this guy on Australia's version of American Idol:
Here's an old live cut of AC/DC:
Any bands up to it?
1. Hells Belles. Recording quality on this one is not great, and I think the bagpipes were a gimmick, but this all-female band in the Pacific Northwest rocks. I strongly suggest you follow youtube links and listen to some of their other AC/DC covers. They are quite possibly the best AC/DC cover band out there. I sh*t you not.
2. Paisan. Awesome performance. Ingenious substitution of accordion for the bag pipes:
3. Skyline. German band. Solid band and vocal performance.
There are probably several hundred covers of this on youtube and no way I can check them all. Please give suggestions in the comments!