I thought it might be easier to ask than try to search and see spoilers: I have (and have read) the four published collections, and I want to catch up with what's happened since then. Can anyone share where I should start on the website to get back into the flow?
If you've read the first four in print, I'd go here. Picks up immediately after Big Red comments on what a lovely day it is.
However, if you've only read the print comics, start over from the beginning online. Every comic has some text to accompany it. And a lot of the pages have alt-text that can be interesting, too