Don’t do the miniature, credit-card sized discs, or the odd-shaped novelty discs, they tend to clog or jam in slot-fed drives, then you’ve lost a customer for life, and anybody he complains about it to…
What I bring home in my bag (you should have bags to hand out, pre-loaded with your own stuff, so the atendees have something to carry everything in) are catalogs, spec sheets, CD’s/DVD’s. Swatchbooks of gels. Post-it notepads stay by my phone. Imprinted Pens are always good, sharpies are better, long as are not too cheap, so they don’t leak easily. Maybe, if you’re going into HD or HDV, you can hand out cardboard aspect viewer frames with a 16×9 window on them and some text about “seeing how our HD services give your world a whole new look”. One company was at one time handing out life-size replicas of their single-rack-unit LCD monitors, and we stuck one of these up on an empty rack space for a LONG time while waiting for a budget to buy them. We eventually did get that brand, after looking at the fake cardboard rack unit for 2 years. It’s still there too;-)
Fashion items like t-shirts or “gimme” caps are of interest only if they (A) fit and (B) truly are cool for some reason like very innovative/collectible art on them or a logo with exceptional snob appeal. Or (c) they have something very clever, funny and “inside” on them, a catch phrase common to the business like: “You can fix that in post, right?” and the reverse side would then say something like: “Yes, We can, we’re XBGLE FX company, miracles are our buisness”. Something like that, maybe hats that say “miracle worker” on them, etc., while keeping your logo tastefully small and unobtrusive, like on the sizing band in the back.
Raffle prizes or other giveaways of pricy consumer toys like MP3Players, we generally can’t accept due to ethics rules, and I imagine that’s pretty common at lots of businesses and agencies these days.