First of all, you need to know that I am an "old school" type of guy who generally cringes at the use of any kind of power sander unless I am coerced by extreme arm twisting. I do nearly all my sanding by hand with no more than patience, sweat and sometimes a sanding block such as this one from 3M.
If you are looking for the best possible result, zero sanding marks, and don't mind spending countless hours sanding, a sanding block is the way to go. This one is available in our online store and it is very inexpensive. I consider a sanding block to be a staple item and is something that no respectable woodworker should be without. Click Here for details on this 3M Sanding Block.
Now, for those of you who hate sanding by hand, don't have the patience of a patron saint, and will settle for great quality, instead of pristine and flawless, you are going to need a power sander. One of the companies making power sanders that I like a lot is Milwaukee. The Milwaukee name has always had a great deal of respect within the woodworking industry, with a reputation for tough power tools. This Milwaukee 6021-21 Orbit Palm Sander is no exception to the rule. It is lightweight, easy to use, and is a tough little guy. Orbital sanders like this one are mainly designed for smaller projects and finish sanding and this model does that job very well. It has variable speed and comes with a case and dust collector. Sandpaper changes are a breeze with the hook and loop style pad. For those of you who want a lightweight, easy to use sander, for small to medium projects, I recommend the Milwaukee 6021-21.