The minor glyphs are very "meh" to me. Nothing great really and for the major I liked the defense of the ice armor glyph and the additional damage of the frost nova. I am currently frost, although some folks have said I should level as fire, but I'm a creature of habit and leveled my main as frost so I'm pretty comfortable with it.
I am, however, going to put my next couple of points in Fire Blast so I'll probably then take the Glyph of Fire Blast.
Euripedes from Critical QQ did an awesome breakdown of the mage glyphs and their suitability for raiding, soloing and pvping.
I'm sure as I hit the higher levels I will change up my glyphs, but for where I am now I think these glyphs work quite nicely. Here is a full list of the mage glyphs.