I'm using a progressive system from the book "Progressive Blackjack" by Donald Dahl. I will give you his $5 progression
5,5,7,7,10,10,15,15,25,25,35,35,50,50....
The idea is that after you win the first bet you never go negative. If you win the first two and then lose the third you are up $3. After you lose you go back to 5. The idea is that if you go on a losing streak you are losing the minimum, but when youare wining it gets big.
I have had this book for some time and have just gotten up the courage to try on line. I'm still not convinced that it's legit, but I am giving it a try.
Just this morning I was playing a while and I got up to $75. I was up like $300 and I had an 11 to the dealers 6. I almost wet myself. I doubled down, I got an ace and he didn't bust. Oh well I still won about $125 for the session.
Other parts of the system are that you skip one level with a 3/2 blackjack and skip two with a double down or split. So if you are on the first 5 and get a bj, then go to the first 7, if you doubled down then you would go to the second 7.
To all you card counters, I know, I know, it's not as good as counting cards, but it is the best that I have found. If you get on a run the money piles up fast.