I just cracked 300k a couple days ago -- I'd really like to hit 500k by Cataclysm, but it might be close. I doubt my stock is enough:
~18 of every glyph except charred, and herbs to finish the stacks after milling.
2 of every epic gem (except about 5) on the AH and a stack of each uncut gem.
Eternals and rare gems to make 100+ of each epic gem after cooldown is removed.
1 tab of uncommon gems - I cut and post as needed but the rest might get d/e'd with Eternal earth.
2 bank tabs of enchanting mats (mostly infinite dust but about 300 abyss crystals too)
2 bank tabs of saronite ore
I stopped making flasks when I switched to my alch to transmute spec last week. At one point I had 500 ea of stoneblood, frost wyrm and endless rage but they are almost all gone (80 stoneblood left.)
I also need to get my ench/insc DK from 71 to 75 so I can max his professions when cataclysm comes out.
80 Druid (JC/LW)
80 Warlock (Herb/Alch)
71 DK (Ench/Inscription)
Misc low-level alts hold and post the glyphs.
Edit: thought I should add I'd be a lot closer except I bought about 50k "worth" of stuff in ICC GDKP runs and also bought a tundra mammoth, motorcycle, dalaran ring, and Haris Pilton bag to spam achieves on guild one day