I'm with Pandalet; my biggest issue is when I call about 10 miles out for an inbound clearance and after only passing my call sign being told 'standby', and then left for 10 minutes with very little other traffic on the radio until I call again, and a very annoyed controller tells me to 'standby, I'll get back to you'. In this instance another 10 minutes passed before he did respond to me. Lots of fuel burned unnecessarily as I stooged around outside the zone. At least he could have offerred reason for the delay or let me know how long he would be. Of course, this inordinate wait was a one off, but being told to 'standby' for several inbound track miles is a pretty regular occurrance nevertheless.