Grenades

Grenades can change 1v3 clutch situations to 1v2 or even to 1v1. I recommend everyone gets a lot of practice with them because it can be a total game changer. It can also go from Rad to Bad which can cost you matches but this is why you practice nading in pubs and pugs. Make sure you cook the nade and throw it at locations where enemies are hiding. You can also save them and have them on your side for when you have to clutch, but I think saving them this long can be waste of gear. Make sure to not fry your allies with them because they will be raging at you.

Black Ops Patch!!!

View thread - PC Community Update (12/2/10) - Call of Duty: Black Ops - Coming 11.09.10


YAY They are coming out with the first major patch, I'm hoping that everything will be fixed!!

Movement

Movement is by far the best skill you can acquire in any game. Being fast allows you to not block your team mates and get to the capture point before your enemies get to you. Being fast also enables you to surprise enemies and get them to "twitch" and it gives you a higher advantage of getting the frag.

Not Playing Stupid

This is a tip mainly for beginners, I am very impatient in pub games so I always rush out and usually get 1-2 frags while doing that. When you get aggravated that you keep getting fragged  and cant get any kills I'd suggest to stay back and think of  the most possible locations where enemies would be hiding. Also take a glimpse of the area and see where everyone is, from there you can make your plan to get your frag. When you peek you take the risk of getting shot by the sniper. If the map is big I would grab a sniper and change the game around for my team. If someone peeks you usually get a free frag, making the game a 5v4 situation or how ever many you can get with the sniper. It also highly depends on the game mode you are playing.

Digital Vibrance

For me Digital Vibrance does a huge roll in gaming for me. It helps me notice my enemies a tad bit faster, due to the color change of my enemies. It helps me see better with my peripheral vision, and enhances my reaction time.
Digital Vibrance is in the Nvidia Control panel, under adjust desktop color settings. I put digital vibrance to 100 and you will see a significant change on your desktop and in game.