Easiest way to strain fry oil?
You can buy really large filters for this purpose.  It's how some restaurants filter their fry oil on the cheap.  We had two conical strainers and put the huge coffee-like filter between the two so it wouldn't slip down as much, also so we could skim out the large bits easier.  If you have a laddle you can sorta force it through faster by agitating in a plunger like motion but be careful the oil isn't too hot because it will splash at you.

Places that do alot of frying have a machine that will filter the oil while still really hot and pump it back into the fryer.

For home use I use coffee filters, the biggest I can find, and have a plastic 4 litre storage tub for holding the oil.  It takes awhile for it to pass but it keeps it cleaner than a cheese cloth I find.

The more particals you filter out the longer the oil will last before you have to toss it in your diesel truck ;-).