The Sabco/White Labs FermFlask is great for both dry hops and anything else added post fermentation (like fruit or other adjuncts), but it's not cheap and is bigger than most homebrew batches (made from a HB sanke keg) so unless you're making BIG batches at home it's probably not useful.
Ha yeah I just looked it up, that's bigger than my average batch (I generally don't do more than 5 gallons unless I'm brewing for an event). I could probably buy some attachments for the NorCal yeast brink to do a similar procedure and then attach it under positive pressure.
Sounds like I'm going to need to buy a 20# CO2 tank too.. I'm sure glad my wife likes beer