Deals are aplenty this weekend with THQ titles discounted at Steam, savings on The Elder Scrolls series at GamersGate, and a solid EA bundle on Amazon with Mirror's Edge, Bulletstorm, The Saboteur, Mercenaries 2: World in Flames and Burnout Paradise: The Ultimate Box for only $9.99. Amazon also has 40% off Sleeping Dogs, GameFly offers 75% off BioShock 1 and 2, Civilization V, Spec Ops: The Line, and The Darkness II, Get Games has Saints Row: The Third for $9.99 (cheaper than Steam's THQ promo), while Green Man Gaming offers Sniper: Ghost Warrior for $2.99 and Hitman: Blood Money for $1.99.

Steam
83  THQ Collection $49.99 (50% off)
78 Darksiders II $24.99 (50% off)
82  Darksiders $9.99 (50% off)
72 Company of Heroes Complete Pack $12.48 (75% off)
83 Saints Row: The Third $19.99 (50% off)
68  Saints Row 2 $7.49 (50% off)
79 Metro 2033 $9.99 (50% off)
70 Homefront $9.99 (50% off)
75 Warhammer 40,000: Space Marine $14.99 (50% off)
80 S.T.A.L.K.E.R. Bundle $17.49 (50% off)
86 Warhammer 40,000: Dawn of War II - Complete Pack $29.99 (50% off)
84 Red Faction Collection $29.99 (50% off)
Titan Quest $7.49 (50% off)
Gratuitous Tank Battles $9.99 (50% off -- today only)
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Amazon Digital
79 Mirror's Edge + Bulletstorm + The Saboteur + two more for $9.99 (89% off)
80 Sleeping Dogs $29.99 (40% off)
86 Battlefield: Bad Company 2 Ultimate Digital Collection $9.99 (67% off)
75 Supreme Commander 2 $4.99 (67% off)
78 Tropico 4 $19.99 (50% off)
81 Vessel $4.99 (67% off)
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GameStop
64 Binary Domain $9.99 (75% off)
84  Rift $9.99 (50% off)
Freespace 2 $9.99 (50% off)
Dreamcast Collection $4.49 (85% off)
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GamersGate
76  Pacific Pack $4.50 (90% off)
73  Sanctum $3.38 (66% off)
93  TES V: Skyrim $35.97 (40% off)
{pf id: size:small} TES V: Skyrim Dawnguard $13.97 (30% off)
{pf id: size:small} TES IV: Oblivion GotY $9.98 (75% off)
{pf id: size:small} TES III: Morrowind GotY $7.98 (63% off)
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GameFly
87 Civilization V GotY $12.49 (75% off)
74 Spec Ops: The Line $7.49 (75% off)
77  The Darkness II $7.49 (75% off)
86 BioShock 2 $4.99 (75% off)
BioShock $4.99 (75% off)
X-COM: UFO Defense $1.25 (75% off)
MLB 2K11 $4.99 (75% off)
SpellForce Platinum Edition $2.49 (75% off)
SpellForce 2 Gold Edition $3.75 (75% off)
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Green Man Gaming
61 NecroVision: Lost Company $0.49 (97% off)
90 World of Goo $2.99 (70% off)
57 Reign: Conflict of Nations $0.49 (97% off)
80 Trine $2.99 (40% off)
73 Dark Sector $2.99 (69% off)
80 King's Bounty: The Legend $2.99 (69% off)
76 Men of War $0.99 (93% off)
74 Men of War: Red Tide $0.49 (97% off)
60  Sniper: Ghost Warrior $2.99 (85% off)
81  Tropico 3 $2.99 (69% off)
Deus Ex: GotY $2.99 (62% off)
Deus Ex: Invisible War $2.99 (62% off)
Hitman: Blood Money $1.99 (80% off)
25% off downloads via code "GMG25-EVFWS-4Z4ZN" (doesn't stack, but works on preorders)
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Get Games
83 Saints Row: The Third $9.99 (75% off)
83 Anno 2070 $15.99 (60% off)
83 Alan Wake Collector's Edition $15.99 (50% off)
76 Sega Rally $3.49 (56% off)
Far Cry 1 + 2 $6.25 (75% off)
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GOG
86 Legend of Grimrock $7.49 (50% off)
60% off many Activision titles