A Squinkie is about an inch tall and has no movable parts. As you can see, they're "cute" versions of the characters. There are currently five lines of Marvel Squinkies - Series 1, Series 2, Super Hero Squad, X-Men, and Good vs Evil. Each line is very limited - about 12 figures in all. You can buy them in small random packs but it is nice that you can buy the entire series for about $10 in a bigger pack as well.
There's some overlap in characters from series to series but they make them slightly different, such as Johnny Storm with flame and without.
I think the cute little guys would be great decorations for around your workspace or on a bookshelf at home. I would be tempted to set them up to recreate classic scenes from the comics.