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 Connected Discourses (Samyutta Nikaya). These documents are my notes from that study period. There isn't commentary on every single sutta in the Samyutta Nikaya, to say the least, or even on every samyutta (note that IV is altogether missing), but here's what I have.
We used Bhikkhu Bodhi's magnificent translation (here's a link to it), which contains reams of commentary as well.
There's also a fine set of online translations (not quite complete) by Thanissaro Bhikkhu, to be found at the Access to Insight website. This is the link to the section on the Samyutta Nikaya.
I: Sagathavagga
1 - Devatasamyutta
3 - Kosalasamyutta
4 - Marasamyutta
6 - Brahmasamyutta
II: Nidanavagga
12 - Nidanasamyutta
14 - Dhatusamyutta
15 - Anamataggasamyutta
16 - Kassapasamyutta
17 - Labhasakkarasamyutta
18 - Rahulasamyutta
19 - Lakkhanasamyutta
20 - Opammasamyutta
21 - Bhikkhusamyutta
III: Khandavagga
0 - Introduction
22 - Khandashamyutta
23 - Radhasamyutta
24 - Ditthisamyutta
25-27 - Okkantisamyutta-Uppadasamyutta-Kilesasamyutta
41 - Cittasamyutta
V: Mahavagga
45 - Maggasamyutta
46 - Bojjhanagasamyutta
47 - Satipatthanasamyutta
48 - Indriyasamyutta
50 - Balasamyutta
51 - Iddhipadasamyutta