In my experience, there is no "easy" linux to use. Bottom line is simply this, if you are a windows/Mac OS user, you will have to relearn an entire operating system. Most major linux distros can be manipulated enough from desktop and menu environment to satisfy many windows users. Any Mac OS user should be a little ahead of the game as it uses a nice command line to accent it's ops anyway. To maximize the potential of whatever linux distro you choose, you will have to learn command line functioning and little words like compile will become household words to you.
I'm not trying to make it sound difficult or scray. It's just like anything else you've done all your life and decide you want something different. You have to learn it to best use it.
As far as "best" distro's. There isn't really one. There are some real crap ones, but then again, all the packaged ones are great. It's down to your preference, and really whichever you choose and get used to. I personally prefer SuSE Linux, although a person who prefers Fedora (previously known as Red Hat) will always wonder why. Slackware users use the slim speediness of it and usually crack jokes like "real geeks use slackware". Mandrake is good as well. I would advise to stay away from linspire. I don't really know much about puppy, so I would have to take the word of acklan for it's abilities. Here's a few links to some of thier download pages to help you decide;SUSEFedora ProjectMandrake (aka Mandriva)
Anyway...those are the big 3 (arguably) in the linux world. Don't be fooled about lack of support, it's simply not true. You may not get the support you want from the company which produced it, unless of course you buy the boxed set. You will find there are a million communities out there to help you out. The biggest and in my opine, the best is Sourceforge
. If they don't have what your looking for, it's either not around yet or you don't need it.
I hope this blabbering was helpfull to you.