So, I hear people talk about this line of sight business a lot, and when I finally go to read about it, it doesn't exist. I did find a thread where jj says to refer to the 3e rules, but I'm confused on them too. So, if anyone can point me to something that now exists to cover these rules, or exactly what rules I should reference to figure this out, I'd appreciate it.
If I have total cover, then am I protected from line of sight?
If I use scrying spells and stuff and can see people, can I use line of sight spells on them?
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From the Glossary:
A line of sight is the same as a Line of Effect but with the additional restriction that that it is blocked by fog, darkness, and other factors that limit normal sight (such as Concealment).
A line of effect is a straight, unblocked path that indicates what a spell can affect. A line of effect is canceled by a solid barrier. It's like line of sight for ranged weapons, except that it's not blocked by fog, darkness, and other factors that limit normal sight. A line of effect starts from any corner of your square and extends to the limit of its range or until it strikes a barrier that would block it. A line-shaped spell affects all creatures in squares through which the line passes.
With that out of the way, we can answer your two specific questions:
"If I have total cover, then am I protected from line of sight?": Yes. Line of Sight has the same restrictions as line of effect, with additional ones based only on vision. Total Cover blocks line of effect, so it also blocks line of sight.
"If I use scrying spells and stuff and can see people, can I use line of sight spells on them?": No.
a scrying spell creates an invisible magical sensor that sends you information. Unless noted otherwise, the sensor has the same powers of sensory acuity that you possess. This level of acuity includes any spells or effects that target you, but not spells or effects that emanate from you.
There is a specific list of spells that have a small chance of working through some Divination spells (like Scrying).