Experience with security cameras?

I am looking for a decent security camera system. The system needs to be reliable, I want to be able to access the cameras remotely and there needs to be a web client, because I use various OSes and can not always have Windows available. Four cameras should be enough. I would appreciate recommendations and general advice.

Back story: What brought up the idea was that we repeatedly had trash dumped illegally on the side of our lot and I want to catch the culprits, but while I am at it I also want to secure the rest of my property.