I've bought some Joes for accessories to use for SW customs mostly, not much else though... I tend to avoid Joes for customs.
I'm more impressed with the modern Joe line though... I still prefer the accurate proportions of the vintage RAH but modern Joes are getting pretty heavy with the articulation.

In the "news" front though for 1:18 military...
-BBi's at some toy show going on right now and displayed an F-18... OH YES! at approximately 3 ft. long, this is one HUGE Fighter.

Come On Star Wars, compete with that! I want a scale Y-Wing... It still wouldn't even be this big.
BBI also displayed their LAV in packaging with a driver that has goggle outlines from the desert sands... Very cool, and their new Abrams Tank with driver which also looks spot-on scale and DAMN good.
-21st Century was also recently at a con displaying things like their deuce and a half troop truck (The only WW2 item I was gaga over though because I can't collect planes much). They did display multiple planes though, including the Messerschmitt in winter white which does look sharp, and I believe the new P-47?
21st is still in the game, but when/where they show up is up in the air because I never truly accept 21st's timeline as the truth. They say we should see some of the planes at Wal-Mart soon.... I'm more interested in figures though. Where's my battle of the bulge fgures? 1st series resculpts? Marines and Japs? Come on!
-Dragon came out with new images of some U.S. Infantry that look pretty damn sharp... I hate that Dragon won't go for articulation, and subsequently they don't get as much of my $, but I will buy a set of these. Great sculpts as always from Dragon and will look nice in a display I think.
Well, here's to hoping that 21st gets back in the figure game soon because they were putting out the top-notch figures for a while.
BBi's taken the reigns, but have some work to do to get perfection. I think series one of theirs were better than series two (The marines) as the marines have awkward leg scupts that seem too close together. They're close to having the BEST figures on the market though so I hope BBI keeps changing things to improve. And I hope BBi jumps into WW2 here soon too!