Party is one of the few sites that provides for automated access to observed hand histories. The ability to have 10 simultaneously open tables provides access for a massive amount of data mining. I data mine from Party 24/7, and although I only started doing this seriously relatively recently, I have imported well over a million hands in the last few months.
There are some indications that in the very near future Party will be dropping support for observed hand histories.
The short-term implication for me is that I will give more thought to the types of games that I am spending my data mining time on. I think my database is light in the $15/$30 and $2/$4 games, very light in the $20/$40 and $30/$60, and somewhat light in the MTTs and $10/$20 6max. So I need to carefully consider which games are most important for me to mine before Party closes the door.