Royal, et al,
The slide collecting hobby is, as Tim mentions, pretty stagnant at the moment. I went over to the MUC
convention a few weeks back and the group of collectors there remained the same as last year (averaging 50 or so while the FRA
Fall convention will be near 125 attending). Very few new entrants, which of course is a shame, however for those who are wondering about "entering" the realm of collecting, or shooting slides, the majority of us collecting are looking at Fuji Provia 100F as the new benchmark film once K64 (and remaining K25) processing goes away at the end of this year.
The Fuji film's biggest benefit at the moment is it's price. K64, at it's last benchmark price in 2009, was around 10.95/roll USD without processing. Add a 10 dollar/roll processing thru Dwayne's and a 1 dollar "Kodak" stamp that they offer and you are looking at 21.95/roll. Fuji Provia 100F, with processing mailers that Dwayne's accepts, runs 10.38/roll. All of the major slide lists (Avimage, AviationTrade, Udo Schaefer's, etc.) are accepting Provia 100F shots so for those who want to tinker with the film, it may be worth your while.
The biggest problem that fleet collectors have these days is the lack of slide photographers worldwide. Many times, an A320 will be painted up, flown for a few months and returned to the original airline with only a digital shot to prove it. The frustration mounts (pun intended!) with every passing month. Europe for the most part is covered, the US only has about 5-10 actively shooting slides and Canada still has a couple. So for those in places like Asia (especially China!), South America and Russia, those who decided to shoot slides could really earn some extra cash that could lead to better digital products for their bag.