The Dayton Hamvention has different appeals for different people. I've attended just about every year since 1989. Long ago, I gave up on the outside vendors. Simply too much to see and too much stuff that didn't interest me. I do go back every year to tour the inside vendors primarily to see what's new on the market. I go on Friday because the crowd is typically a little lighter compared to Saturday.
As for what's new: Icom was displaying the IC-7600, which is the IC-756 replacement, along with two new D-Star radios, IC-80 handheld and IC-880 mobile. Kenwood had nothing new though was making strong hints about a TH-D7 VHF/UHF/APRS handheld replacement (which may include a GPS receiver) and a TS-580 HF replacement...both coming in 2010. Yaesu was showing the FT-250/270 replacements for the FT-150/170 handhelds. Those are the highlights I remember from the major radio manufacturers.
There's always something at Dayton that really stands out. For me, it was the Luso "crank-up" tower. It consisted of five 36-foot sections with a total erected height was around 140 feet. The triangular base was about 6 feet on a side. Suggested retail price? I heard $60,000.
Yes, the Friday crowd did seem a little light compared to past years. The weather was a bit warm and humid on Friday and thay may have kept the crowd outside. The number of inside vendors was down noticably. The wood floor area that I think they call the "ballarena" was about 2/3 of its past size; the east ends of both the East Hall and the North Hall were pretty sparse. Again, I don't do the flea market, but what I could see of the west end of the outside area looked considerably less than last year. On the other hand, I did notice a big line outside the VE testing area.
I made a few small purchases and ordered a Kenwood TM-D710 from AES ($460) which will arrive on Monday.