There are more, but usually they are different types of the same thing. 403b is a 401K for the public/npo sector, etc. 401K, 403b, FSA, SEP, Simple, Keough, etc. are all qualified plans. As far as I know you can't max(in combination) any of these out more than the highest contribution limit of those you own. I'm not sure about that, but I had a minor discussion with an accountant several months ago about this and he said as qualified retirement accounts they all play against each other. IE you have a max of 46K in your SEP and you put 5k in a 401K, now you can only put 41K towards your SEP.
A 457(something offered to NPO, gov employees) isn't a qualified plan its a deferred comp plan and therefore allows another tax sheltered amount equal to the 401K. We do a lot of work in deferred comp(primarily Supplemental Executive Retirement Plans--SERPs) and that is another way to shelter more money(and do tax arbitrage between the company and you), but the employer has to set it up. The last one is life insurance(what we traditionally use for the SERPs). If all of the above is maxed out Life insurance can offer limitless amounts of tax sheltered money. Look into indexed universal life(max non mec funded). With wash loans it acts like a Roth.
Oh and pensions, too. But those are disappearing fast. Also tax deductible oil drilling programs offer limitless amounts of tax deductibility. ESA too, but the max drops from 2K to 500 like next year.