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vice president (no hyphen); VP (uppercase, no periods)

voice mail

Web (see also Internet [link to 9.4.3.e Alphabetical List Of Style Preferences - I])
Always capitalize the first letter since you are referring to the larger World Wide Web.

Web site
Two words with Web capitalized. exceptions: webcam, webcast, webmaster

which, that (see that, which [link to 9.4.3.e Alphabetical List Of Style Preferences - T])

who, whom
An easy way to determine which is the correct usage is to turn a clause into a sentence, replacing who with he/she and whom with him/her

Bob Smith, who attended Saint Anselm College, was born in Manchester. (He [not him] attended Saint Anselm College.)
To whom should I give my payment? (Should I give my payment to him [not he]?)

work-study, work-study program

World Wide Web (see also Internet [link to 9.4.3.e Alphabetical List Of Style Preferences - I] and Computer Terms)
Capitalize all words.