Online Slots Books/Literature

Does anyone know what a good read would be to learn more about online slots?

Well I found some titles but I can't vouch for them:

Slot Machine Strategy: Winning Methods for Hitting the Jackpot -MacIntyre Symms

Secrets of Modern Slot Playing – Larry Mak

Slot Experts Guide in Slots Playing– John Robinson

All Slots Made Easier #2 –Gayle Mitchell

Powerful Profits from Slots – Victor H. Rayer

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The Slot Machine Answer Book: How They Work, How They've Changed and How to Overcome the House Advantage-by John Grochowski.
(Note:personally didn't read it but has many good reviews..)         

By the way, thought this was quiet interesting. -sorry it's kinda long.
 
-Most slots reward you for playing the maximum number of coins.
For example the jackpot may pay 2000 coins with 2 coins played, but 4000 coins when 3 coins are played.
If you don't feel comfortable playing the maximum coins you might consider moving down to a machine that accepts lower-value coins so you can play the maximum.
For example instead of playing one coin at a dollar machine, play the maximum number of coins at a quarter machine. Some online casinos let you play for nickels. If you’re playing a progressive machine, remember that you'll probably have to bet the maximum number of coins to be eligible to win the big jackpot.
 
-Only play the best paying slots.
Look for slots that payout between 95 and 99 percent and only play those.
Players should note that machines that require $1 and higher machines usually payout 95-99%.
Statistical research data indicate that $5 or higher machines have the highest percentage payout range.
The range starts at 93.7% and goes up to 98.5%. Remember - these are ranges and averages, not absolute values.
The next highest payouts come from $1 machines followed by 50-cent machines, 25-cent machines, and 5-cent machines.
You will often see signs that say "Up to 98% payback" indicating that they have loose machines.
This means that over the long term the slot will pay out 98 cents of every dollar that is played.
The "up to" is the key point here. It means that a casino could have only one machine set to pay back at 98% to comply with the sign.
If you find an area of slots with a sign without the "up to" you may want to give it a try.
 
-Know the odds.
The result of each spin of the wheels is determined by a computer program that generates random results.
This is true for both online slots games and slot machines found in hotel casinos.
The machines can easily be set by the casino to generate whatever payout they choose. For example, they may set it to 95%.
That means for every 100 dollars bet, the machine will, on average, pay out 95 dollars.
The other five dollars goes to the casino and that's how they make their profit.
Of course, that’s just on average. It’s possible, if Lady Luck is on your side, to make hundreds or even thousands of dollars with just one spin.

I can't say that I've actually read any of them but Amazon has a great bestsellers list.

Amazon Bestsellers List