Most slice of lives are set in or around school although there are plenty of exceptions, most notably the fan favourite Planetes.
SoL's are noted for their episodic nature, slow pacing and general absence of over all plot. Hell, most don’t even need to be watched in airing order. These make the genre a great choice for casual viewing.
Rather than list every slice of life I can think of I’ll be lazy and throw this up;
http://tvtropes.org/pmwiki/pmwiki.php/Main/SliceOfLife (caution: This site is notorious for eating up up any free time you may have)
This doesn't cover a quarter of them but it's a good starting point.
Other note worthy series include: Manabi Straight, Moyashimon, Bamboo Blade and Chi's sweet home.
Being so plot light there isn’t really much to talk about (and we already have trouble when it comes to talking about anime as it is) which is why this thread is basically covering a whole genre. Feel free to post anything you want on anything to do with these shows from which ones you are currently watching, choice moments or why you think these shows are horribly dull and need more ninjas, anything at all is welcome.
Unless mods say otherwise I’m also happy to host any talk on SoL manga here as well.
Azumanga Daioh (probably the best of the High school shows),