Best study tools on the net or books I currently don't have a teacher and I'm looking for good study guides for the sutta's. I mean I'm reading them but when it comes to interpretation often I'm at a loss. Is there a source(s) or book(s) that can help with this? I know they're is no substitute for s teacher but until such time I'm working on my on.
Piya Tan at http://dharmafarer.org has translations and commentary of many of the suttas. Using the "sitemap" on the right or bottom of the page, you can find specific suttas (sorted by number), or, his "sutta discovery (SD) series" which is sorted thematically.

Some people disagree with [some of] his commentary (see e.g. this topic).