I've purchased quite a few gadgets and gizmos lately, so I'll post a comprehensive list and my experience.
Fotasy NSQF Anti-Slip Sling Neck Strap with Rapid Fasten:
I used to hate my old Canon strap, I never felt I could easily just sling my camera to my side and I hated it around my neck. This strap is extremely comfortable. I used it this past Sunday during an 8 hour shoot while using my T2i and 70-200 f/2.8 Sigma (a heavy lens). I picked it up for $20 on amazon and definitely recommend it to anybody who's tired of the neck straps.
Neewer 4 Channels Wireless/ Radio Flash Trigger Set With 2 Receivers:
This is used with my Neewer TT680 flash. Overall they do a good job and I've no issues with them not working as expected. They're very easy to setup, but keep in mind prior to purchasing these that TTL is not transmitted. I use these mainly when I don't want to use my on-camera flash for triggering the flashes in slave mode. These use AAA batteries. $20 on amazon
Neewer® NW680/TT680 Speedlite Flash E TTL Camera Flash:
Can't say enough good things about this flash unit. It produces amazing results and I can't see how the Canon 480ex could produce results that justify the price difference. It includes TTL, slave mode (can be trigger by other flash units), hi-speed sync (don't be limited to 1/200 shutter speed). I honestly have 0 complaints with this unit. $65 on amazon
Rainbowimaging TMC LCD Timer Remote Control for Canon:
Another accessory I couldn't live without anymore. I used to use the Canon RS60 E3 cable, which does it's job perfectly, but it was not an intervalometer. This remote control is perfect for me as I use it a lot for time-lapse astrophotography, lightning photography, and long-exposure shots. It has a slight learning curve so PLEASE read the manual. $25 on amazon