What are some good sites for Divrei Torah, and what are the strengths of each?
YUTorah has a tremendous wealth of audio and text lectures from YU faculty, alumni, students, and events. The site is well-organized, so you can search for and find material on pretty much any topic you can think of. You can also subscribe to a speaker's materials as a podcast and get automatically updated each time there's new material. I can't recommend this website highly enough.
A thought provoking parsha analysis, coming from an academic standpoint can be found here: http://parsha.blogspot.com/
The DovBear blog has some interesting notes in his ParshaNotes postings:
The Hirhurim blog has a weekly Parsha Round Up which summarizes online divrei torah from many sites: http://www.torahmusings.com/
You may want to check out http://www.revach.net/shiur/
I don't know who he is, but he's been on here. His DT's are thought provoking and good to say over.
Amazing Dibre Torah are given at LearnTorah.com by Rabbi Eli Mansour Shelit"a. The strenghs of his Divre Torah are that they are something you won't find anywhere else with his unique style and interesting Hiddushim.
The Israel Koschitzky Virtual Beit Midrash is from Yeshivat Har Etzion. I recommend it.
DafYomi.org is good for Daf Yomi or just looking something up. The day's Daf shows up by default, and every Daf is available for reading on demand. You can also download podcasts of each Daf individually or by Masechta. R' Dovid Grossman's style might leave something to be desired for some, but you can't beat a fully explained Daf in 30-45 minutes.
The biggest repository of Torah recordings in multiple Languages.
The largest collection of Video shiurim from a wide variety of speakers.
Great articles and essays on the Parsha and other topics.
Free shiurim and downloads of many famous and prominent speakers.
https://www.theshmuz.com/ by Rabbi Ben Tzion Shafier
lots of well prepared and thought provoking shiurim