Steam's Annual Holiday Sale Underway!

FINAL EDIT: I don't plan to update this post every day.  Steam's deals are changing on a daily basis, so definitely check them out each day.  The updates to the sale occur at 1pm EST (FYI Battlefield Bad Company 2 is down to $6.80 - you're nuts if you don't snag this deal).
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Steam's annual holiday sale is now underway and there are some pretty fantastic effin' deals. The deals change on an almost daily basis so if you see something you've had your eye on, definitely snag it. It will be tough if not impossible to find a better deal anywhere.

The first four on the list below are strongly suggested as "must buys" if your gaming tastes are anything like mine.

Portal $ 3.74 (how do you NOT own this yet?) EDIT: up to $ 7.49 if you missed the sale

Battlefield Bad Company 2 $ 6.79 (if you have the system for it and enjoy FPS games, this is a MUST BUY) EDIT: up to $ 14.99

Titan Quest Gold Edition $ 4.99 (awesome isometric view action RPG) EDIT: up to $ 9.99

Fallout 3 Game of the Year Edition $ 20.09 (this is a no brainer if you don't already own it) EDIT: up to $ 22.49

Super Meat Boy $ 3.75 (I've been looking for an excuse to buy this) EDIT: up to $ 7.49

Unreal Deal Pack $ 14.99 (includes all Unreal games including a personal favorite, UT2k4)

Valve Complete Pack $ 49.99 (incredible deal including these games: Counter Strike, Counter Strike Condition Zero, Counter Strike Source, Day of Defeat, Day of Defeat Source, Deathmatch Classic, Half Life, Half Life 2, Half Life 2 Deathmatch, Half Life 2 Episode One, Half Life 2 Episode Two, Half Life 2 Lost Coast, Half Life Deathmatch Source, Half Life Blue Shift, Half Life Opposing Force, Half Life Source, Left 4 Dead, Left 4 Dead 2, Portal, Ricochet, Team Fortress 2, and Team Fortress Classic)

A bunch of Indie Packs at $ 4.99 each

Star Wars Republic Commando for $ 4.99

Bioshock 2 for $ 13.99 EDIT: down to $ 9.99

Misadventures of PB Winterbottom for $ 0.49 (yes, 49 cents!)

Borderlands for $ 13.39

Dig around. This sale is ridiculously awesome.

EDIT: There are already changes since I posted this! Look at the text above - if a price changed I included it in an edit. New sale items I think are worth it below:

PuzzleQuest $ 1.50 (punch yourself in the nuts if you haven't already played a version of this on your phone, DS, PSN, XBLA, PC, Speak and Spell, C64, etc)

Lara Croft and the Guardian of Light $ 5.10 (I bought this at $15 on the PSN and it's well worth that so this one is a no brainer)

Resident Evil 5 $ 10.20

Defense Grid $ 2.00 (for you tower defense junkies, this is one of the best that exists)