donations and customs

[justin at shiningsilence.com]

> Nice to have the donations list on the main site now, but it would be nice
> if a little blurb about donating to developers abroad and how to avoid
> getting raped by^W^W^Wdealing with customs. Stuff like labeling it
>  non-commercial and specifying a value of 0 on the packing slip are
> things that were mentioned on IRC.

Which countries is this specific to?  What other options are there?  How
legal are these manuvers?