While I'm back with Opera again after using other choices on computers I had no control over, I too wish that Tahoma be part of standard choices of fonts. I deal much in Romanized Sam'skrit, which uses a couple of punctuation marks that work well in Tahoma, available in only in one or two overused and dull font styles I certainly don't use.
Tahoma has its own merits as a preferred font choice, though the needs of conveying Sam'skrit properly are imperative for my work.