The Mastrad Qwik Wisk ($19.99) gives me another option, particularly for small quantities. The Qwik Wisk holds a bit over a cup, so it's a good choice for a few small servings of whipped cream. It operates with an up-and-down motion, with two spinning disks doing the whipping in the enclosed container.
Like many kitchen gadgets these days, this is another that would be great for kids who want to help in the kitchen, since the motion is simple and the mess is contained. Also great for folks who have lost some manual dexterity.
I tested it first (and second and third) by making whipped cream, and it did a fine job - just as good as I'd get from using a whisk and a bowl, but less messy. Next, I made salad dressing. And last, mayonnaise.
I have to say that I was particularly pleased with the mayonnaise, since making that in small quantities can be annoying. With too few egg yolks, a standard blender won't grab the yolks to beat them before adding the oil, and a stand mixer is overkill for a small job like that.
Since the Qwik Wisk's lower disk reaches all the way to the bottom of the container, it had no trouble grabbing and whipping a single egg yolk in preparation for making mayonnaise, and it had no trouble incorporating the oil, even when I glugged it in a little too fast. And, since you're doing this by hand, you can feel the ingredients thicken as you whip.
While this wouldn't be useful for someone who makes whipped cream by the gallon and mayonnaise by the quart, it's quite useful for someone who wants to make a cup of whipped cream or mayonnaise and who doesn't want to dirty a big bowl in the process.
The rubber base of the whipper comes off and becomes a lid for the container, so you can use it for storage of the finished product, if you like.
And, completely irrelevant - it's kind of fun to use.