I print mostly on cotton, (matte, archival), photorealistic, canvas, and a little vellum.  I have an Epson and it is pretty versatile.

any tips for printing on vellum?
I find it take AGES to dry and is a little spotty quality
I've used it in the laser printer but thats only black and limits my options

I have printed on a variety of Cardstocks, thin chipboard, canvas, vellum, transparencies, sticker paper, photo paper, art paper, origami paper, ribbons, Tattoo sheets, window cling materials and post-its - to name a few things.

I like to stick things through my printer. I try out all kinds of products in it LOL. My poor printer!

Di, there is a really neat little pouch thingy... I can't remember the name of it - hrm The Scrap Perfect Pouch maybe? That you can rub onto slick surfaces to make printing possible. I've used it before , though it has been a while, and it worked well.

I haven't had the opportunity to try Hawk Mountains Vellum but all the papers I've used from them have printed gorgeously.  I have used the Vellum by World Win Papers and they print wonderfully. You can see some examples of use with them in the Same Products Different Takes article in Issue 3.  It was quick drying and easy to use.