I am also tall (5'10") with very long limbs. I need 35" inseam for flats and longer for heels. I rarely find pants with which I can wear more than a 2 inch heel, so I save my higher heels for skirts and dresses.
You've already gotten some excellent suggestions, but I will add a few (some from personal experience and some I've heard from others).
1) Eddie Bauer also has tall sizes and they have much more modern styles than they used to. The talls are only available online or through their catalog, but if you call from their store (try on the regular there and then order the tall), you get free shipping!
2) With the Gap long lengths, I often take down the hem allowance (often up to 2 inches) for extra length. You can do that with their tall (or extra-long) lengths as well for even more length, but the longer length is only available online and you'll have to pay shipping (sometimes they have free shipping or you can get it if you order more items).
3) Many of the premium denim lines run very long. I've had some luck with Paige, Hudson (although their styles skew young for me), and some Seven styles (the Ginger is a good one).
4) Check hem allowances when shopping. Many trousers have quite a lot of extra length to be had if you take the hem down. I have a tailor who does so much work for me that she gives me excellent prices. Of course, if you learn how to do it yourself, all the better!
One extra tip regarding skirts and dresses, which often are far too short on me! I have gotten maxi-length items and had them hemmed to my desired length. That way, it's my choice how long I want something to be! And with the new midi length, many maxi skirts and dresses will end up being that length on us anyway!
Hope this helps.
