Sketches like Dead Parrot, Hell's Grannies, Kilimanjaro Expedition and Bicycle Repairman are classics! I marvel at the sheer brilliance of this show! It is one of the greatest comedy series of all time, hands down! It indeed deserves it's own thread!
Apart from the ones you mentioned, here are more favourites of mine from series one:
I can honestly, watch this show for hours! My mom loves it too. I can't wait to get the DVD's for series 2, 3 and 4!