Litecoins are currently worth (at this second) 3.94 USD, I am mining 4.7 of these every 24 hours, I pay 10.9p per KwH, my PC is consuming 400w, so I am paying £1.05 every day in electric and make $18.52, after converting to GBP this is 12.07, less the £1.05 gives me a net profit of £11.02 every 24 hours. Clearly this will diminish over time, but hopefully the share price will increase, this is the gambling part.
I have been doing this for just over 2 months now, have 297 litecoins that I could trade in at any second and earn 762.76, less my electric cost of £70 and it's easy money.
Going to keep at it for another month or so then pay for me and my family to go on holiday.
This is with 2 undervolted 7950's, only doing 1000 khash/s as I am balancing the increase in khash with a sharp rise in KwH produced at the wall with over clocking the cards.