I was able to resolve this. In look around on my system, I found that I had a folder called "BeerSmith2.new" that had different versions of the Style.bsmx files:
[imarlier@shiva Documents]$ ls -altr BeerSmith2.new/Style*
-rw-r--r-- 1 imarlier staff 764936 Nov 23 2011 BeerSmith2.new/Style5.bsmx
-rw-r--r-- 1 imarlier staff 764936 Nov 23 2011 BeerSmith2.new/Style4.bsmx
-rw-r--r-- 1 imarlier staff 764936 Nov 24 2011 BeerSmith2.new/Style3.bsmx
-rw-r--r-- 1 imarlier staff 764936 Nov 24 2011 BeerSmith2.new/Style2.bsmx
-rw-r--r-- 1 imarlier staff 764936 Nov 25 2011 BeerSmith2.new/Style1.bsmx
-rw-r--r-- 1 imarlier staff 764936 Nov 25 2011 BeerSmith2.new/Style.bsmx
This is in comparison to the ones that were in the BeerSmith2 folder, which you can see are much smaller:
[imarlier@shiva Documents]$ ls -altr BeerSmith2/Style*
-rw-r--r-- 1 imarlier staff 159694 Dec 18 18:36 BeerSmith2/Style5.bsmx
-rw-r--r-- 1 imarlier staff 159694 Dec 19 07:33 BeerSmith2/Style4.bsmx
-rw-r--r-- 1 imarlier staff 407532 Dec 27 19:01 BeerSmith2/Style3.bsmx
-rw-r--r-- 1 imarlier staff 407532 Dec 28 15:29 BeerSmith2/Style2.bsmx
-rw-r--r-- 1 imarlier staff 407532 Dec 28 15:29 BeerSmith2/Style1.bsmx
-rw-r--r-- 1 imarlier staff 407532 Dec 28 15:41 BeerSmith2/Style.bsmx
Moving the files from BeerSmith2/ out of the way, and copying the ones from the BeerSmith2.new/ directory into BeerSmith2, got all of my style profiles back.