Here's the list used in my campaign. Note: We don't use alignment and have replaced it with a concept we call taint. Normal creatures are untainted. Some of the more bizarre creatures (especially evil and weirder neutral extraplanar types) are tainted (the "neutral" of the taint scale). Anything that looks like it would fit right in a Call of Cthulhu game is foul (the opposite of untainted) - usually aberrations and really warped stuff. This scale is used in our campaign to determine summoning a certain creature will contaminate the summoner (a notion specific to our game world).
BTW, I developed my scale by looking over the typical CRs of most critters that get summoned up, producing a ball-park range from that and then combing the books for critters. Weak creatures with unusually strong powers got bumped up or were simply not added. Oh, and our setting has a strong middle-eastern flavour to it so genies, rocs and stuff like dragon turtles turn up.
1st level
CR 1/3+strong ability or CR 1/2
Corollax [MM2]
Dire Rat
Dog
Jermalaine (tainted) [MM2]
Moonrat [MM2]
Neogi, spawn (foul) [MM2]
Twig Blight (tainted) [MM2]
2nd level
CR1/2+strong ability or CR1
Bariaur [MotP]
Devil, Lemure (tainted)
Eagle
Felldrake, crested [MM2]
Formian, worker (tainted)
Ixitxachitl, average (foul) [MM2]
Shark, medium-size
Stirge (foul)
Wolf
3rd level
CR1+strong ability or CR2
Azer
Bladeling (tainted)
Choaker (foul)
Demon, Dretch (tainted)
Demon, Mane (tainted) [BoVD]
Elemental, small
Felldrake, spitting [MM2]
Hippogryph
Kython, Broodling (foul) [BoVD]
Paraelemental, small [MotP]
Salamander, flamebrother
Skum (foul)
Thri-Kreen (foul) [MM2]
Thoqqua
Triton
4th level
CR3 +/-1
Arrowhawk, juvenile
Demon, Rutterkin (tainted) [BoVD]
Devil, Imp (tainted)
Ethereal Filcher
Ethereal Marauder
Fihyr (foul) [MM2]
Hellhound (tainted)
Howler (tainted)
Ixitxachitl, vampiric (foul) [MM2]
Magmin
Pegasus
Phase Wasp [MM2]
Stone Spike [MM2]
Tojanida, small
Unicorn
Vargouille
Xorn, small
5th level
CR4 +/-1
Archerai (tainted)
Arrowhawk, adult
Devil, Spinagon (tainted) [MotP]
Displacer Beast (foul)
Elemental, medium-size
Energon, Xag-Ya [MotP]
Energon, Xeg-Yi [MotP]
Ephemera, Dusk Beast [MotP]
Felldrake, Horned [MM2]
Formian, warrior
Genie, Janni
Grell (foul) [MM2]
Griffon
Hydra, 5-headed
Kython, Juvenile (foul) [BoVD]
Mephit, any
Minotaur
Neogi, adult (foul) [MM2]
Paraelemental, medium-size [MotP]
Quasit (tainted)
Salamander, average
Shadow Mastiff
Tojanida, medium-size
Vaath (foul) [BoVD]
Yeth Hound (tainted)
6th level
CR6 +/-1
Belker
Chaos Beast (foul)
Cloaker (foul)
Demon, Bar-lgura (tainted) [BoVD]
Demon, Uridezu (tainted) [MotP]
Devil, Barbazu (tainted)
Devil, Erinyes (tainted)
Devil, Hellcat (tainted)
Elemental, large
Genie, Djinni
Gibbering Mouther (foul)
Hydra, 6-headed
Kython, Adult (foul) [BoVD]
Kyton (tainted)
Manticore
Marrash (tainted) [MM2]
Paraelemental, large [MotP]
Phase Spider
Psurlon, average (foul) [MM2]
Rast
Slaad, Red (tainted)
Sphinx, Hieracosphinx
Wyste (foul) [MM2]
Xorn, medium-size
7th level
CR7 +/- 1
Aboleth (foul)
Arrowhawk, elder
Athatch (foul)
Chuul (foul)
Demon, Armanite (tainted) [MotP]
Demon, Babau (tainted) [BoVD]
Demon, Bebilith (tainted)
Devil, Hamatula (tainted)
Devil, Kocrachon (tainted) [BoVD]
Devil, Osyluth (tainted)
Dragonne
Elemental, huge
Frost Salamander [MM2]
Genie, Dao [MotP] – cannot grant limited wish
Hook Horror (foul) [MM2]
Hydra, 7-headed
Invisible Stalker
Kopru (foul) [MM2]
Kython, Impaler (foul) [BoVD]
Paraelemental, huge [MotP]
Ravid – alone
Slaad, Blue (tainted)
Sphinx, Criosphinx
Tojanida, large
Umber Hulk (foul)
Will-O’-Wisp (foul)
Wyvern
Yugoloth, Mezzoloth (tainted) [MotP]
8th level
CR9 +/- 1
Barghest (foul)
Darktentacles (foul) [MM2]
Demon, Shadow Demon (tainted) [BoVD]
Demon, Succubus
Devil, Cornugon
Dune Stalker (tainted) [MM2]
Elemental, greater
Formian, taskmaster (tainted)
Genie, Efreet [MotP] – cannot grant wish
Genie, Marid [MotP] – cannot grant limited wish
Hydra, 8-headed
Inevitable, Zelekhut [MotP]
Kython, Slaymaster (foul) [BoVD]
Lillend
Mind Flayer (foul)
Nethersight Mastiff [MM2]
Paraelemental, greater [MotP]
Psurlon, elder (foul) [MM2]
Rogue Eidolon (foul) [MM2]
Salamander, noble
Slaad, Green (tainted)
Sphinx, Androsphinx
Sphinx, Gynosphinx
Vilewight (foul) [BoVD]
9th level
CR11 +/- 2
Avolakia (foul) [MM2]
Barghest, greater (foul)
Beholder (foul)
Demon, Vrock (tainted)
Demon, Chasme (tainted) [BoVD]
Devil, Narzugon (tainted) [MotP]
Devil, Malebranche (tainted)
Dragon Turtle
Elemental, elder
Ethereal Slayer [MM2]
Hydra, 9-headed
Kython, Slaughterking (foul) [BoVD]
Leechwalker (foul) [MM2]
Mooncalf (foul) [MM2]
Night Hag (tainted)
Paraelemental, elder [MotP]
Rakshasa (tainted)
Roc
Slaad, Grey (tainted)
Xill (foul)
Yrthak (foul)
Yugoloth, Nycaloth (tainted) [MotP]
Yugoloth, Yagnoloth (tainted) [MM2]