i must ask, what technique, brand stain, and brand/style polyurethane did you use to get that gorgeous even color?
Its definitely all in the technique, but I've got the wife to blame/thank for that. The stain was a Cabots Cedar one, for whatever its worth. Make sure you sand your wood first, a nice smooth surface helps with the next stages..
The key is definitely going the whole length of the wood in a single stroke, and overlap each stroke as you go. I applied the stain with a paintbrush, then rubbed it in with a "stain ball".. basically, you take a bunch of cotton balls, and bunch them up in bit of cloth (in this case, a sleeve cut off from one of my old (as in previous company) work shirts.), and tie it off with a bit of string, a rubber band or hair band so the ball is nice and tight/solid. You use the stain ball to rub it in (hard) before it gets a chance to soak into the timber. The stain ball acts by a) rubbing it in evenly into the grain, and b) by soaking up & redistributing any excess stain..
Note: the cloth around the stain ball will probably perish before you're done staining all your bits.. (you're dragging it across timber after all).. so be prepared to make another one before you're done...
Once you're happy with the stain, varnish/wait/sand/varnish/wait/sand/varnish/wait/sand. (ie, 3 coats of clear varnish, with a
very light sand with wet&dry in between coats)
Its seriously a pain in the arse (and the upper arms), but worth the effort in the end.. just.

Cheers,
Brett