My transfer of Mt. Gox -> Dwolla of about US$ 40 was hung up for about 5 days. I contacted Mt., Gox and got the process completed within 4-5 with apologies.
Thus - still a satisfied customer
With several hundred USD in limbo, I am not all that satisfied at the moment. Having said that, this the only glitch to date, so I expect they will straighten it out post haste. I did notice this and posted it in another thread where I found a large number of Dwolla users claiming they didn't get their funds [and Dwolla claiming Mt. Gox didn't send the funds].
Their volume is higher lately, but not as high as it has been or above what they have handled before. My transaction on the 5th disappeared and looking at the data available, they had a MASSIVE drop in volume compared to days before and after, ~43K for the two days before, on the 5th, the volume was ~22K and then on the 6th and 7th ~54K. Something happened on the 5th, precisely the day that my funds have gone missing!
I eyeballed the data from Bitcoin Charts for what it is worth. June 5th, the day of my transaction, the volume bar for Mt. Gox is red with all others green. Clearly something went wrong that day and they have gone dark as far as communication goes.
EDIT: I shouldn't say clearly something went wrong .. volume could have been low, but the surrounding days over a five day period suggest that something may very well have gone wrong [technically I would assume].