Well I was 4 and 5 boxing for some time, then I took a few months break to build my bankroll in Poker
A few days ago The Rupt Brothers came back but with a little change. I started to think why I was so burned out after a lot of the sessions of 5-boxing HC instances and after PvPing, then I thought I'd just try to chill with 3 of the Rupt Bro's (shamans).
After a few days I must say I really enjoy "only" 3-boxing, less lag for one (only playing now with 1 comp), a little less cost (good thing with the world economics ). I've started to grind for cash to get my epic mounts, only 8000g to go, and to get some money for WOTLK.
This is what I have been doing with my 3 shamans (S2, badge gear):

- Plowing through instances like Mana-Tombs normal
- Dailies (quick and good cash)
- Grinding for shadow motes in Nagrand
- Getting tradeskills up

Now this isn't much but I really like the speed of which I can clear the normal instances. I haven't died a single death yet (not even close) so might start with the "Push it to the limit" mentally soon regarding to instances.

Might get back to frapping a bit with the 3-box setup just to keep the interest up through boring times.