HELP!!! Lambda prep...

[Allison]

I'm doing the  "Standard method for purification of bacteriophage 
lambda" (Sambrook et al. pp 2.73-2.76) and at the end of step 11, the 
CsCl step gradient, I'm getting a blue band _above_ a white band, the 
opposite of what the protocol says should result.  Also, the bands seem 
too far up in the tube.  Does anybody know what is happening?  Perhaps 
more importantly, does anybody recommend a better (more recent?) 
protocol?  This one seems long and ripe for catastrophic errors on my 
part.

Allison