These are primarily review sites and blogs, with a few databases and book list sites in the mix

Historical Fiction  

1. Historical-Fiction.com 
2. Historical Fiction Review
3. Historical Novel Review 
4. Historical Novel Society 
5. HistoricalNovels.info
6. Historical Tapestry
7. Prehistoric Fiction Bibliography
8. Reading the Past 
9. Scandalous Women 
10. Tanzanite's Castle Full of Books 

Horror/Paranormal

1. The Horror Fiction Review
2. Horror World
3. Horror Writers Association 
4. Love Vampires - crosses many genres, including urban, fantasy, romance and mystery 
5. Vampire Library 

Inspirational/Christian Fiction

1. Catholic Fiction 
2. Christian Fiction 
3. Christian Fiction Book Reviews
4. Christian Fiction Online Magazine 
5. Fiction Finder by American Christian Fiction Writers 
6. Focus on Fiction

Mystery 

1. Cozy-Mystery.com 
2. Crime Through Time 
3. Detectives Beyond Borders 
4. Historical Mystery Fiction 
5. Mysterious Matters: Mystery Publishing Demystified 
6. Reviewing the Evidence 
7. Stop, You're Killing Me 

Romance

1. All About Romance
2. Fallen Angel Reviews 
3. Mrs. Giggles 
4. Romance Junkies 
5. The Romance Reader 
6. Smart Bitches, Trashy Books 

Science Fiction / Fantasy

1. All Sci Fi
2. Fantasy Book Critic
3. Locus Online
4. SF Site 
5. SF Reviews.net
6. SciFiChick.com
7. Science Fiction and Fantasy World 

Westerns 

1. Reader's Advisory: Westerns - Palm Beach (FL) County Library 
2. Western Fiction Review  
3. Western Writers of America