Konova made a huge impact on the scene when they released their very affordable Roller Bearing slider not long ago. Now they are showing off two new slider versions one for heavier cameras and another for extremely light weight cameras (even down to iPhones). Another optional upgrade they will be offering with their future sliders are 'folding legs'. If you're familiar with the basic version, these new folding leg upgrades should make the sliders easier to pack up instead of having to remove them completely off of the slider rail each time you pack. These are both new sliders which are not available yet, and will not be replacing the original current version found below.
Konova video Camera Rolling Bearing DSLR Slider
Konova is also looking to offer a new three wheel skater dolly similar to a few very high end designs that are already on the market. Using three wheels on a rotating dolly makes it more complicated to line up your subject, but with the use of a Laser pointer, adjustments can be fairly accurate. This new 3-wheeled version (not yet available) will be marketed towards larger and heavier cameras, and will not replace the first version more affordable 4-wheeled version which is found below.
Vimeo member Switch Flick uses pieces from a Flycam Nano to make a DIY Spidertrax Rotating Dolly. Axles are a bit long on this first version, but it looks pretty legit with attention to details down to the bolts (much like I used in my setup). Of course, this is all assuming you've already dished out a bit of change for the Nano.
If you're not familiar with the Flycam Nano, another video was recently shot using a Canon 5D Mark II + 17-40mm F/4L + Rode Video Mic. That's quite a bit of weight, but Vimeo member Spencer Turley managed to pull off some great footage while doing some charitable work out in Tuvalu. Found here: http://www.vimeo.com/20742652
YouTube member TheAussieInLA puts together his DIY version of the SpiderTrax rotational dolly and gets some pretty cool results. Looks like some basic skateboard trucks, skate wheels, and flat steel. [Thanks Alex]
The original version sold at PhotographyandCinema.com is no longer available, but if you're not the DIY type the next best version for the cheapest price is made through Konova. The Konova rotational dolly is well built with an anodized plating and a few fancy graphics. Although they opted to use roller blade type wheels, they flipped the axles upside down and shaved them flat, bringing it closer to the ground for low shots. You can find them following the link below.