I can't wrap my head around all the deals this weekend, but as far as what I think might be of interest to this audience, here's a short list.

Adobe Lightroom V5. (expires in a few hours).
Great Deal especially if you're working with RAW images (or even CinemaDNG files).
Adobe Lightroom V5 $121.00 Now just $72 dollars (found here).

Rokinon Lens Deals.
They seem to be promoting these quite a bit today (and selling quite a few).
Rokinon 14mm F2.8 Ultra Wide Lens - Choice in Mount $279 (found here)
Rokinon 8mm f/3.5 Fisheye (Nikon, Canon, Pentax, Sony) $199 (found here)

Panasonic GH3 Save $300 OFF
Probably the most full featured MFT Video & Photo Camera. It rocks.
Panasonic GH3 Camera -$300 OFF Cyber Monday (found here)

Sigma Macro Lens - ALL MOUNTS -$300 OFF
Portraits or up close details. Great for Wedding & Event Coverage.
Sigma 105mm f/2.8 EX DG OS Macro Lens -$300 OFF - Cyber Monday (found here)

Canon Powershot S110 -$100 OFF
Nothing beats a solid pocketable camera. If you can't afford the $750 Sony RX100, the Canon S110 for just $219 (today) is my next suggestion.
Canon Powershot S110 - Cyber Monday (found here)

Seagate 3TB Drive + THUNDERBOLT Dock
These are so awesome, I own three. If you're working with SSD Sata drives (BlackMagic Cinema Cameras), you can dock directly to this and start editing. Once you work with Thunderbolt Speeds, it's hard to go back to USB. Sucks for me - I paid over $400+ each. Today, you can get it for just $199.
Seagate Backup Plus 3 TB Drive + Thunderbolt Dock Desktop External Hard Drive (found here)

Sandisk Extreme PRO SDHC / SDXC 32GB - 64GB
A must have for the BlackMagic Pocket Cinema Camera to shoot RAW. 64GB will give you about 20 minutes of RAW on the BMPCC, time to stock up. They are now up to 30% cheaper than when I purchased them.
Sandisk EXTREME PRO SDHC / SDXC Up to 30% OFF (found here)

Canon 70-200mm F/2.8L IS II
Newest version. Originally $2499, now down to $2K. But wait, could this also qualify for the current Mail-In-Rebate for an additional $300 OFF bringing it down to just $1700?
Lens Listing: Canon 70-200mm F/2.8L IS II - Checkout Price $2K (found here).
Mail-In-Rebate: Additional $300 OFF (found here)

[Keep checking back as i'll be updating through the day].