The UNC Writing Center has many different resources for different types of writing:

Annotated Bibliographies
Application Essay
Business Letter
Video on Compare/Contrast 
Comparison/Contrast Essay
Essay Exams
Literature Review
Poetry Explication
Book Reviews
Scientific Report

Purdue's Online Writing Lab also has quite a few resources for writing in different genres:

Argumentative Essay
Job Search Documents

Elon University’s Student Professional Development Center has resources on resumes and cover letters:


Cover Letters

See also MultiModal Projects page for tips on composing documents that include mixed media.