So I just cannot stay away from the excitement of tournaments. I usually play 4-6 of them early in the evening and then switch to cash games for new tables when I get down to 2 tables remaining. This way I can still come out positive for the night even if I do not make a final table in tournaments.
There are somethings to be careful with in mixing tourneys and cash games:
Avoid this strategy if you are susceptible to TILT - You are going to get bad beats in tournament play - it is inevitable. If I play six tournaments in a night, I will likely get bad beat out of 4 of them. That is just the nature of tournaments and all the all in hands required. Tilt will lead to big money losses in cash games, so bad beats set you off then avoid mixing cash and tourney games.
Pay attention - In the early and early middle stages of a tourney you can get away with not paying attention. That is a good time to play 4-6 tables at the same time. However, when you get down to the late middle and late stages of a tourney, you need to pay attention to win. You need to know your opponents tendencies. For instance, who is raising a lot preflop but laying down to reraises. That is a great target for restealing chips. Don't open so many tables that you cannot pay close attention in your late tourney tables.
Use two different strategies -- Remember that you are playing both cash and tourneys and they both require different strategies. You can play more fast and loose in a tourney, you need to bluff more in tourneys and you resteal more in tourneys. Don't try these strategies too often at a cash game or you will just lose chips.
Good luck at the tables this week.