My guess is that a lot of you audio nerds will enjoy the animations on this page describing how loudspeakers work.
Via DaringFireball
HiFi Wigwam: Acoustic Energy 1 demos at Purite
If you're located in the UK and just dying to demo a set of budget speakers, head on over to Purite in North Yorkshire, who have just put the new Acoustic Energy 1 for your naysay or yaysay. Ω owns a pair of AE2's from way back in the day and loves them to bits. Cheap as chips but a decent overhead for use with a good variety of amps.