So before anyone jumps to the wrong conclusion, this is "how to travel the world using travel rewards points from targeted credit card sign-up bonuses".
I found on MMM a post that led me to richmondsavers. They had some really fantastic examples of thousands of dollars in free travel legally by first identifying the least amount of reward points required across multiple airlines and then figuring out which credit cards would have the best and most appropriate sign up bonuses.
Unfortunately, it is US centric but I did notice a post at candiantravelhacking. Just thought we could have a nice place here to post tricks and tips.
Myself, for example, when I book hotels, I start by using redflagdeals cash back link to hotels.com. RFD gives me 3% back on the value of what I book. Secondly, hotels.com gives me the cash average of the last ten nights I've booked through them as one free night to be used on a future booking. (So don't think you can book several trips totalling 10 nights at Motel 8 and get a free suite at the Ritz Carlton.) Finally, I pay for all of this using an aeroplan credit card. Triple dipping. I probably get somewhere around $300-$350 cash back, 6 free nights and 10,000 aeroplan points per year.
I can't earn any hotel loyalty perks using this method, but my business travel makes it tough to focus on just one or two brands.