OK here's my take on the shipping issue.
Like Firko I have bought stacks of stuff out from the US and would have to say 99% of guys have been very helpful and obliging. Occassionally you will come across a dickhead or three but hey, they are everywhere. Occassionally you will encounter a trailer park dweller who thinks Australia is where Arny comes from but they are in the minority - or you may encounter a thief as mentioned below !!!
What amuses me are the ones who won't sell internationally and you frequently see them sell stuff so cheaply because they are effectively closing out any additional competition - too bad for them I say (really I say f*** em but this is a family show hence Batman doesn't get a gig anymore, lol)
When buying ask the seller if he will trade internationally and if he says yes put in a low 'test' bid because sometimes sellers are unaware that the options they have selected may cause our exclusion and can be reset. Always tell the seller you are aware of additional postal costs (believe me they can be high - especially from the UK) and if possible make friends with afew US based enthusiasts who can receive and on ship items for you if you are really desparate for the bits. Always check the sellers feedback and contact the people who have had a bad experience. Also it helps if you assure the seller you are not going to be a hassling prick from day one and let him know you will work with him on the options to get it here.
Now to more important stuff ie EXPENSIVE purchases. I had a scumbag ebay seller (Thurlow Paul Scmieding, 28 Lee Circuit, Concord, North Carolina) rip me off to the total of $2850US following a 'buy it now' purchase made in mid 2005 for what was a nice restorable 81 490 Maico with some Wheelsmith mods and as yet I have received neither the bike, a full refund or anything else from him and he claims to be an enthusiast. He has made all sorts of wild bullshit stories even resorting to saying he had kept the money due to a court decision to do with storage and mechanics fees which were never discussed nor agreed to as I would rather have had the bike shipped then and there or walked away from the deal without sending a dime (and he never could tell me the court or file number etc despite repeated requests). This banjo plucking thief even claims to have a mate in OZ who rides a Montessa - that would be bullshit too. The bike was supposed to arrive in March 06 and didn't and he has been lying ever since.
Bottom line is be VERY VERY careful if sending a lot of money overseas and the advice I had is to use a trusted intermediary to pay within the States using a US Postal Service money order which if defaulted on counts as a Federal felony and can earn jail time which is what the good ol' Thurlow should be experiencing but hey he'll get cancer anyway, lol!!! There are also Escrow services which act on your behalf and after what that scumbag did to myself and my family by relieving us of $4000AU at the time I would use an Escrow next time
Most guys are great and quite often will go out of their way to help you - just do your homework and also familiarise yourself with USPS.com which gives all the postal details as some things are simply unshippable by normal post and require couriers and shipping.
If you intend to ship in bikes there are a number of good impoters who have all the right contacts to get by all the bullshit GST etc.
Need more info just ask.................