Hoping this list is useful for you:
You can find them (including the links) on:
http://www.web-directories.ws/Niche/
Niche Directory Categories
@Articles (729)
Business (153)
Computers (57)
Education (124)
Environmental (118)
Health / Medical (156)
Home & Garden (19)
Legal (52)
Pets / Animals (92)
Real Estate (186)
Science & Technology (44)
Shopping (83)
Society (28)
Sports & Recreation (85)
The Arts (36)
Travel (217)
Vehicles / Automotive (64)
Webmaster (97)
