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Quotes should be used in values of attributes (anything after an = within a tag), unless the value is a number combination(0-9), a letter (a-z, A-Z) or one of a few symbols (-, .). All URLs should be encased in quotes, example:
<A HREF="http://www.hwg.org/">The HTML Writers Guild</A>
As should any color references, example:
<BODY BGCOLOR="#000000">
ALT attributes should be quoted, especially if they have any spaces, example:
<IMG SRC="graphic.gif" ALT="Whatever you want here">
Anytime a non-allowed character is used, quotes are needed. Not using quotes can come up with unreliable rendering. BUT (there always is a but), you may use quotes on any and all values without any adverse effects. So, when in doubt, quote :)