I wrote a toy compiler a very long time ago and I'd like to try again. Do you have any links/recommendations for resources that would be a good starting place?

I recall the classic 1986 edition of the Dragon Book spending waaaay too much time on boring details of lexing and parsing. I think it turned many people off the interesting aspects of compilers. It also had an interval-based formulation of data-flow analysis that nobody uses, possibly because it's (a) more complex than worklist iteration, and (b) not applicable to irreducible control flow graphs.

Are newer editions better and more focused on interesting solutions to interesting problems?

I recommend making sure to avoid reading this book, it spends all its time making mountains out of molehills in the easy parts and leaves out the hard parts. How did they write so many pages about text parsing?

The books by Appel and Louden (forgot the names) are good.