so far i've just seen the wooden baton method. i also saw one that used plastic corner type things.
Not understanding what you're talking about, or having a picture to look at, I can only assume you're speaking of dowels in the first instance, and no idea with the second.
Glue, as was mentioned.
Biscuits. Probably harder to line up than most folks care to deal with
Pocket holes. Go to
www.rockler.com and look for something called a Kreg jig. Should be pretty self explanatory. Dunno how it'd work for building a cab, but you could easily take it apart, and if it were a tad wobbly, you could fill the holes a touch with some wood putty before reassembling.
Look for "decking fasteners". These are used in construction of decks for a house. Joist hangers, plate fasteners, corner braces, etc.