Deja Vu Serif and Charis SIL are my two current favourite fonts. They have the best diacritical support of any font with a reasonable size -- i.e. you use kilobytes not megabytes.
For the really off-beat stuff, I'm toggling between Microsoft Arial Unicode and Code2000. Neither is the best font for reading and both have some odd glitches but for displaying any unicode character, they are the best I've found. There is a Linux font with a claim to support even more Unicode characters but since the Latin alphabet looks as if it came from a 9 pin dot matrix printer, I've given it a pass.
Regards,
David
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