At 70, you 2 major glyphs and 3 minor glyphs. At 80, you get 3 major and 3 minor glyphs.

The major glyphs that I plan to get at level 70 are Glyph of Judgment, which increases damage from judgments by 10% and the a Glyph of Seal of Command, which increases the chance of proccing Seal of Command damage by 20% (takes it from 7 procs per minutes (ppm) to 8.4ppm).

The minor glyphs that I plan to get at level 70 are the Glyph of Lay on Hands, the Glyph of Blessing of Might and the Glyph of Blessing of Wisdom.

The Glyph of Lay on Hands increases the mana restored by your Lay on Hands spell by 20%. The Glyph of Blessing of Might increases the duration of your Blessing of Might by 20 minutes. The Glyph of Blessing of Wisdom increases the duration of your Blessing of Wisdom by 20 minutes. The last two glyphs of blessing (of might and wisdom) make those two 10 minute buffs into 30 minute buffs and that is very nice.  Currently, I’ve been using the Greater Blessing of Might and Greater Blessing of Wisdom group buffs so that I could avoid having to remember reapplying whichever buff I was using every 10 minutes. The greater blessings required reagents to use. The greater blessings also cost roughly twice the mana and the non-greater blessings.

The current glyphs suck, I hope they get better once WotLK comes out!