Commentaries from Sutra Study
NOTE: I have studied the Theravada suttas (sutras) as part of a study group for some years now. During one year, we devoted ourselves to the Numeric Discourses (Anguttara Nikaya). These documents come from my notes from that study period. There isn't commentary on every single sutta in the Anguttara Nikaya, to say the least, but here's what I have.
The only complete translation of the Anguttara Nikaya in English at the moment is that of the Pali Text Society. It's available through Pariyatti Press--here's the link here. (I understand that Bhikkhu Bodhi is in the process of writing a new translation that will complement his magisterial renderings of the Samyutta Nikaya and the Majjhima Nikaya (in partnership with Bhikku Nanamoli.)
There's also a fine set of online translations (not complete) by Thanissaro Bhikkhu, to be found at the Access to Insight website. This is the link to the section on the Samyutta Nikaya.