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I don't know if anyone knows this already or not but I'll still post it for those that do not,
Say for example you make 2 new channels in a new document. on one channel you have a white square and on the other you have a white circle. normally to select the contents of one of the channels you would have to ctrl click but instead press Ctrl +Alt+ 4 to select the first channel you created(the one with the square) and Ctrl +Alt+ 5 (to select the white cirlce in the second newest channel) ..*I think this shortcut can be used up to at least 9 channels?**
Hey that's a good one doc, and one that's not usually talked about either.
To select 2, or more channels in the 'usual' fashion, one would hold the Ctrl+SHIFT keys down, while clicking the additional channels channel. Same goes for the layers.
Channel Selection 
Linear Mode
