It would be helpful to know if you're having aggro problems on single target tanking, or multi-target tanking, as those tend to have different issues.
However, here's some basic points that will help with both.
Get rid of IBF immediately. There was a period where due to bugs it was helpful to have the glyph, however, they've since been fixed and Glyph of IBF is specifically built to bring non-tanks IBF damage reduction up near a tanks damage reduction (it effectively puts a lower bound on how little reduction IBF provides), if you have enough defense to bring your IBF's damage reduction above 30% (which is pretty much assured if you're def capped) then you are receiving no additional benefit from the glyph.
Get rid of UA. This isn't as mandatory as replacing IBF, but it's still not a great return for a major glyph slot.
Get Glyph of Frost Strike, and Glyph of Obliterate. They make your second and third best sources of single target threat cheaper and stronger respectively.
Consider swapping HB for IT. HB is a nice utility glyph, but you can achieve almost the same results by spending a little more effort managing rune cd's and pestilence, IT currently provides more RP which = more FS/RS, and after 3.3 will simply provide more threat everywhere (after 3.3 IT will probably be a higher priority to get than Obliterate)
Fill out Bladed Armor, it's pound for pound one of the best tanking threat talents in any classes' tree.
Get Glacier Rot and Rime. They're two of the core Frost dps/threat talents. They make everything you're good at better, and provide free HB procs.
Get 5/5 Blade Barrier. It won't improve your threat but it's flat, always up damage mitigation. There's no excuse not to have it in a tanking build.
The previous four talents are pretty much mandatory, Chill of the Grave isn't quite so required, but it's a good threat return for the points if you are having threat or RP generation issues.
Places to get the points to fill those talents out:
Icy Reach. Utterly pointless in non-pvp builds. No one kites you in pve, and 90% of the time you're staring a boss-crotch anyway.
Deathchill. A lot of people like it for 'snap aggro', but honestly if you're tanking properly and your dps isn't utterly pants on head retarded it's usefulness is pretty limited.
Morbidity. Half the talent is wasted since you don't use Death Coil, and the other half is lackluster because Frost tanks don't use D&D all that often.
Butchery. The RP gen on this talent just doesn't compare to Chill of the Grave or Scent of Blood, ditch it.
Subversion. Again, a lot of this talent is going to waste (the threat reduction). The extra crit is nice, but you get better threat per point by investing elsewhere.
Lichborne. Not much fears/charms/sleeps you in pve, and when they do it's better to invest in a pocket shaman for tremor than rely on a 2m cd. Useless since they took the avoidance boost off it.
Acclimation. Again, I like the talent, but it just doesn't provide enough avoidance for the investment. It's fine to throw some excess points in, but don't fill it out while you're missing some of the above key talents.