It appears that it has also become harder to have two windows open and consistently refresh (or perhaps there is a delay built into the server). However, I still feel like writing a brief HOW-TO for those who haven't played before.

Evolution
It's a bit early in the game perhaps to talk about this, but of the things available in the shop, and evolution pill is a good deal. You retain your current attack and defence weapons, but become much better at attacking and defending. It represents good value for money. Also, when you evolve your icon changes to have an "e" next to it. Don't fight people with an "e" as they'll whip you easily.

Although it's not as easy as it used to be, finding two people with their health percentage set low, with their levels higher than you, in two different windows, is still probably the fastest way to play. Simply switch between them hitting refresh each time. However, knocking people out is now more lucrative as you get money from them. I'm not actually sure you get the full contents of their wallet (I haven't got more than 2000 pounds yet), but it's still not a bad deal.

New Knock-out Rule
People are now systematically going through and knocking out as many people as they can on lower levels, with the intention of finding money. This means there is less money to find this way, but also that those who have their health set lower are easier to find, as they are the ones that are not knocked out.