CL: PCL, PAIP(also belones a bit with Scheme), On Lisp, Hyperspec, CLTL2, Keene's OO in CL, AMOP, plenty of nice papers and some free books.
Scheme: SICP, HtDP, LiSP(lisp in small pieces, also belongs with CL too), RnRS, Lambda Papers (plenty), a lot of awesome papers (hygienic macro systems are theorethically awesome, even if I'm more in then CL camp of procedural ones when it comes to actual practical use; scheme compiler in 90 minutes is also very cool as it features continuations too)
On other CL books: Land Of Lisp also appears fun, but I haven't read it, so I still recommend PCL as the starter book. Let over Lambda has lots of cool tricks the advanced Lisper may or may not know, but I think the book teaches some bad practices too, so I would only recommend it to advanced Lispers who can judge for themselves. ANSI CL(PG's) was my first CL book, however while it's a decent book, Graham's CL is not the most idiomatic code one can write, and it also omits various things, especially those that he doesn't like, so I ended up reading it in parallel with PCL.
As for Scheme books, SICP is perfect, but I wouldn't fault anyone with starting with olde Lambda papers or HtDP, there's a lot of things that just LAMBDA and TCO can bring you, and some Lispers don't realize the true power of those two combined (THE ULTIMATE GOTO).