I've found that the command line
unzip tool doesn't gracefully handle some of the files I'm unzipping: it makes a bunch of junk directories, and creates files whose resource forks aren't found. (Perhaps they were created strangely.)
$ unzip -d NEW-DIRECTORY ZIP
Archive Utility is a start, because I can run the following and it is close (and it doesn't mess up my files):
$ open -a "Archive Utility" ZIP
But this does not allow me to specify a new directory for the contents!! It automatically puts them in the current directory. :P
What are my alternatives?