Originally Posted by
UAPremExecflyer
www.points.com is one
Not the best one, I'll say.

Just read through
the master thread for Points.com and decide for yourself.
Instead, take a look at
Webflyer Mileage Converter and see any possible conversion is worthwhile.
Originally Posted by
umuddafadda
I have plenty of cc pts (amex/saphire/marriott) but always want to try 'n convert them to airline miles @ optimum point...
Just keep in mind converting them into airline miles may not give you the best or optimal value. If you need to learn about what's the best or better use of your points in amex/saphire/marriott, you should visit their respective fora on FT and see how people put them into good use:
American Express Membership Rewards (Not sure MR is the Amex pts you have though)
Chase Ultimate Rewards
Marriott Rewards