Chances are if they are flying VFR they probably don't know the Center frequencies in the area unless they are Flight Following, or just listening for the fun of it. Personally If I'm flying VFR I don't usually listen to anything except my CD's, unless I'm in a terminal area or I think it's going to be unsafe to do so, but like I said I very rarely fly VFR anymore, (I fly weather research aircraft to pay the bills and needless to say there really isn't a need for clear weather research.)
As far as him flying into IMC, It really all depends on the situation. Most times you can see clouds and know when you are headed for one. but around this time of year it's really eaiser then you think to get into a cloud and not know it, specially with the lower level stratus type clouds because it just slowly drops visibility untill you realize you can't see anything anymore. And I'm assuming what happened is, it's very easy to want to pitch up when you enter a cloud, specially if it has a defined wall, so I would assume this guy did exactly that and since he was in cruse he probably didn't have full power in(not that power matters) and ended up stalling the plane and spinning which he fortunently managed to recover from, Sounds like a very lucky guy. I would have to say I would check my pants afterwords if I got in a situation like that.
The transponder depending on the plane is sometimes a pain in the @$$ to set in a hurry and it usually isn't the first or even second thing you think of. I can't tell you how many times even using a checklist I've forgotten to turn the Transponder from Standby to Altitude/ON when taking off. I probably wouldn't have thought about the transponder either in this guys situation.
Question for JLHDU When a Pilot sets the Xponder to 7700 it puts a flag up on the radar data tag saying EMERG right? and 7500 puts HIJACK? It's been a long time since I've see a radar screen and I'm definently not a Traffic Controller so I was seeing If I was right, what does 7600(communications failure) put up?
Thanks,