You could paginate the list, in a simple form, but include at the top the 
values already selected on other/previous pages.





You also might consider letting the user type a few letters of what they want, 
and show them the matching results to be added. This presumes most users have a 
familiarity with the possible selections.





Another option might be to put in a collapsing tree-like structure a la GUI 
file-systems like Mac OS.



So all the values would be on the page, but they'd show/hide the hierarchical 
groupings of interest.



But this only makes sense if the data can be intuitively laid out as a 
hierarchy.



And it presumes Javascript-enabled viewers, which may or may not fit long-term 
plans involving cell phones and/or disabled users and/or whatever.

[The preceding sentence is an attempt to head off the endless JS thread that 
often seems to follow a JS solution]



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