My favorite filter for them outdoors, but this is somewhere where you really can't skimp out on. I've tried mutiple times (I think 4-5 times) to be satisfied with a cheapo filter, but it's never made me happy. I've owned a Hoya and B+W CPL filter, and those were . It's cool and all, but the amount of time I spend on landscape isn't worth keeping. I'd be much happier with some light modifier that I can use anytime. Also, CPL filters are fairly annoying because it's a whole extra step after zooming and focusing to get the proper polarization.
Again, something I would never skip out on again. The cheap Targus/Sunpak/Sony plastic/aluminum tripods I will never spend my money on again. I'd only go for a Manfrotto or Benro, maybe something similar. Don't need the be-all and end-all Gitzo, but would like to something carbon fiber with a decent ball head.
-White Balance Card, Color Checker
During shoots I'm always too fast paced to remember to use these. Maybe I should slow it down and force myself to use one regardless of whether or not I decide to color correct in post, just so I have a minute to stop and think things over again.
I've gone through a ridiculous amount of gear, especially shoulder bags, and they've all been sold off, reason being that I can't do shoulder bags for long periods of time. My camera gear outweighs a majority of you guys because I like heavy, but only in my hands, not on my shoulder. I didn't carry around a backpack full of books throughout grade school, so I never learned to be as rigid as a camel.
-Cokin filters/square filters
Way too tedious, the maintenance felt too high, since there's no lip to rest them on compared to a circular filter. I also ended up getting nasty flare from them when I tried to stack several filters (even with the hood attachment) because of the relatively large space between the glass/plastic? pieces