I'm not 100% sure how legit this link is by Otogi, but http://www.giantitp.com/forums/showthread.php?100736-3-5-List-of-Half-Breeds has a list of all the half breeds.  The link also tells you what book this information would be in as well so all of it can possibly be confirmed.  

It appears you can do Dwarf, Ogre, or Beholder according to it.

> Base
>
> Half-Elves (Human/Elf) - Player's Handbook
> 
> Half-Orcs (Human/Orc) - Player's Handbook
> 
> Half-Ogres (Human/Ogre) - Races of Destiny, Savage Species, Bastards &
> Bloodlines
> 
> Muls (Human/Dwarf) - Dark Sun 3.5
> 
> Aasimar (Human/Half-Celestial) - Monster Manual
> 
> Tiefling (Human/Half-Fiend) - Monster Manual
> 
> Gensai (Human/Half-Elemental) - Races of Fearun
> 
> Feytouched (Humanoid/Half-Fey) - Fiend Folio
> 
> Allear (Elf/Giant Eagle) - Bastard & Bloodlines
> 
> Alicorn (Elf/Unicorn) - Bastards & Bloodlines
> 
> Blinkling (Halfling/Blink Dog) - Bastards & Bloodlines
> 
> Burrower (Gnome/Umber Hulk) - Bastards & Bloodlines
> 
> Decatuar (Elf/Centaur) - Bastards & Bloodlines
> 
> Green Folk (Human/Lizardfolk) - Bastards & Bloodlines
> 
> Grendle (Human-Dwarf/Troll) - Bastards & Bloodlines
> 
> Half-Gnoll (Human/Gnoll) - Bastards & Bloodlines
> 
> Half-Goblin (Halfling-Gnome/Goblin) - Bastards & Bloodlines
> 
> Half-Hobogoblin (Dwarf/Hobogoblin) -Bastards & Bloodlinse
> 
> Half-Bugbear (Elf/Bugbear) - Bastards & Bloodlines
> 
> Half-Kuo-toa (Dwarf/Kuo-toa) - Bastards & Bloodlines
> 
> Houri (Elf/Nymph) - Bastards & Bloodlines
> 
> Jovian (Human-Orc-Half Orc/Hill Giant-Fire Giant-Frost Giant) -
> Bastards & Bloodlines
> 
> Krestel (Halfling/Harpy) - Bastards & Bloodlines
> 
> Lasher (Dwarf/Roper) - Bastards & Bloodlines
> 
> Lurker (Gnome/Cloaker) - Bastards & Bloodlines
> 
> Merg (Human/Merfolk) - Bastards & Bloodlines
> 
> Mind Ripper (Humanoid/Mind Flayer) - Bastards & Bloodlines
> 
> Morlok (Gnome/Troglodyte) - Bastards & Bloodlines
> 
> Piper (Elf-Halfling/Satyr) - Bastards & Bloodlines
> 
> Spring Child (Humanoid/Dryad) - Bastards & Bloodlines
> 
> Sthien (Elf/Naga) - Bastards & Bloodlines
> 
> Trixie (Gnome/Pixie) - Bastards & Bloodlines
> 
> Watcher (Dwarf/Gargoyle) - Bastards & Bloodlines
> 
> Wendigo (Dwarf/Frost Wolf) - Bastards & Bloodlines
> 
> Woodwose (Elf/Treant) - Bastards & Bloodlines
> 
> Wretch (Orc/Hag) - Bastards & Bloodlines
> 
> Wyrd (Elf/Ogre Mage) - Bastards & Bloodlines
> 
> Changeling (Human/Half-Doppleganger) - Eberron Campaign Guide
> 
> Shifter (Human/Lycanthrope) - Eberron Campaign Setting
> 
> Fey'ri (Sun Elf/Demon)- Races of Fearun
> 
> Tannaruk (Orc/Demon) - Races of Fearun
> 
> Chaond (Human/Half-Slaad?) - Monster Manual II
> 
> Zenthyir (Human/Half-Lawful?) - Monster Manual II
> 
> Whispling (Halfling/Demon) - Fiend Folio
> 
> Maeluth (Dwarf/Devil) - Fiend Folio
> 
> Mechanatrice (Human/Inevitable) - Fiend Folio
> 
> Shyft (Human/Ethereal Creatures?) - Fiend Folio
> 
> Half-Kender (Human/Kender) - Dragonlance Campaign Setting
> 
> Draegloth (Drow/Demon) - Monsters of Fearun
> 
> Mephling (Humanoid/Mephit)
> 
> Template
> 
> Half-Dragons (Anything/Dragon) - Monster Manual
> 
> Half-Celestials (Anything/Good Outsider) - Monster Manual
> 
> Half-Fiends (Anything/Evil Outsider) - Monster Manual
> 
> Half-Elementals (Anything/Elemental) - Manual of the Planes
> 
> Half-Fey (Anything/Fey) - Fiend Folio
> 
> Half-Minotaur (Humanoid/Minotaur) - Dragon Magazine
> 
> Half-Vampire (Humanoid/Vampire) - Libris Mortis, Bastards & Bloodlines
> 
> Half-Illithid (Non-Human/Illithid) - Fiend Folio
> 
> Half-Rakshasa (Anything/Rakshasa) - Dragon Magazine, Bastards &
> Bloodlines
> 
> Half-Beholder (Anything/Beholder) - Bastards & Bloodlines
> 
> Half-Titan (Anything/Titan) - Bastards & Bloodlines
> 
> Half-Doppleganger (Anything/Doppleganger) - Dragon Magazine, Bastards
> & Bloodlines
> 
> Draconic (Humanoid/Half-Dragon) - Draconomicon, Races of the Dragon
>
> Half-Farspawn (Anything/Far Realm Entity) - Lords of Madness

Someone let me know if I shouldn't have copied the info from the link over or if I should only have brought the relevant info over.

> Muls (Human/Dwarf) - Dark Sun 3.5
> 
> Half-Ogres (Human/Ogre) - Races of Destiny, Savage Species, Bastards &
> Bloodlines
> 
> Half-Beholder (Anything/Beholder) - Bastards & Bloodlines