I like when the album images are similarly sized. 500 x 500 only guys, c'mon.
I spend way more time than I'd like to admit ensuring my posts are 500x500.
I do as well, but it's really easier said than done many times...
Also, I always thought that 600x600 was generally accepted... I try to keep it 500x500, or 600x600 if I can find it, and like I did the other day, post a 700x700 and apologize for it... it's not that much bigger. Plus, what does our automatic resize cap it down to, 800?