Trying to work out what sort of timber this could be, some nice colours if i can get it dry without twisting to much. Do those numbers mean anything to anyone ?

HT/DB - I think that is just saying it is heat treated. IPPC - International Plant Protection Convention, I think the EU is a big backer. MY-010 - I'd guess Manufacture Year 2010? What was delivered on the crates... where was the origin? The thinner boards will be almost unusable, by the time they warp. Depending on what you make, you'll need to work with the nail holes. Nail holes can create a nice recycled look anyway. It's bloody hard work, depending on how dry the timber is. Old Oregon and WRC is easily the best stuff to work. Old recycled Oregon from Old Growth forests can have really tight packed grain... Far superior to new school Oregon from plantations... Far superior in term of furniture grade. You can get some really nice big hanging beams out of some houses being demolished. Even roofing rafters, except roofing rafters have more nails to remove... roof battens nailed into them. Even though you are probably attached to the timber you already have... if you think outside the square, you will be able to get some far better timbers from a house demolition site.... Old house... Also, potential for some beautiful Aussie Harwood Redgums, or similar. It's hard as nails, but beautiful colours. Old Oregon is about 7 times easier to work, especially with traditional hand tools.

Possibly paulownia.

HA HA , Its freakin heavy, still as green as i suspect? Still, i'll strip them down stack it in the garden shed over summer and see what happens? I've just built a fire drum out of an old webber so all will not be lost.

I think meranti is light. Pirrad says it's heavy, but it may be unseasoned

My first thought was Meranti (to look at) but then I thought surely not in pallets?

Huh. I thought it was sort of OK stuff. Maybe they plantation farm it for cheap uses then?

I think it's a tropical/jungle tree. So it either grows pretty quick and is sustaniable and cheap, or, its slow growing and the forests are getting raped, and its still cheap but will run out. If Simondo is right on what the stamp is then it might be the former.

pretty sure its fire wood.

^^^ my first thoughts where of maple also. If you intend joining for book shelves or the like alternate boards rings up rings down looking at the end grain. Helps cupping over the width of joined board. The tight rings suggest it came from small trees and will more than likely be prone to cupping.

The pallets, or at least the contents come from China.

No idea on the species of timber. I can shed a little light on the stamp. Very basically - When goods are shipped to Australia, and timber is used on the pakaging, the stamp indicates the timber has been treated and is free to pass through quarantine. Its all codes so the quarantine can determine country of origin etc. The HT/DB in this case is the approved treatment used - look it up before you burn it as firewood or else you may end up toxic fumes in your lounge room.

Some wood

i think it is meranti and sapwood rubbish cut from the outside of the tree, hence the massive variation in colour, cant really be used for anything commercial except pallets but hey you can make whatever out of it, wont move much once dry and held together a 1000 screws hope there are no termites near your shed, its a big feed for them, they are already salivating

Not only that it will cook your dinner for you , and then wash up !!!!