I guess now is a good a time as any to go over our league's trade policy.
Trade Policy - Trades will stay pending per Yahoo's policies.
I will only overturn trades in 2 scenarios: 1 - I am somehow convinced that an accident occurred in an accepted trade. 2 - If a trade is seriously, I mean seriously, out of whack - e.g. LeBron James for Kyle Korver. Usually, there's collusion if a trade like this goes down.
Other than that, I usually let things go. In every trade, there's going to be a side that seemingly gets the better end of the deal and I'm not one to nitpick (at least officially). I still get to complain though.