The trinity of net annoyance: Spam, Spim and SPIT:

A new plague of unwanted messages threatens internet users, according to a US company. Spam and spim - spam by instant messenger - are about to be joined by "spit" - spam over internet telephony. Qovia, based in Frederick, Maryland, have recently filed two patent applications for technology to thwart spit

(from NewScientist.com).