Knoxx (now part of Blackhawk) have launched a thumbhole variant of their recoil dampening Talon (shotgun) and Axiom (rifle) stocks.
The recoil system resembles the rear shock absorbing system on mountain bikes
The Talon is available for the Remington 870, Mossberg 500 and Winchester 1300. The Axiom is available for the Remington 700, Howa 1500 and Weatherby Vanguard.
Murdoc has more info about the Talon and Axiom over at GunPundit.
KNOXX (Owned by Blackhawk) have introduced a tactical style stock for the Ruger 10/22 rifle called the Axiom R/F. My guess is that the R/F stands for RimFire.

As you can see in the photo, the stock features a 6-position M4 style adjustable stock, pistol grip and free floating barrel channel. The MSRP is $99.99

I think this is going to be a *very* popular product. I think the price is good and it has been build for accuracy. Rimfire rifle tactical stocks tend to be build for looks not function.
More info and online ordering at Blackhawk.
[ Usual disclaimer for linking to an online store ... I get no financial benefits from linking to Blackhawk ]

The sidewinder is an interesting thing. It’s a magazine feed conversion kit available for the Mossberg 500 and 590; along with a system of six round box, or 10 round drum magazines. This allows for rapid reload, and rapid changes of ammunition type, which I appreciate; as well as greater magazine capacity in the shortest possible barrel length (no long mag tube extensions).
I should say it WAS available; last month Knoxx took it off the market, because they couldnt manufacture it economically for the quality they wanted; and belive me that quality is very high. Although the finish on the kit leaves much to be desired, it is INCREDIBLY tough. There are videos on the Knoxx site of the sidewinder mags being run over by pickup trucks, and thrown 30 feet onto the ground with no more damage than scratches.
More here and here
Hat Tip: GunPorn