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Both are Apple event bridges for Ruby; however, appscript is a mature, pretty much finished product that provides about the same level of flexibility, functionality and application compatibility, while RubyOSA currently isn't/doesn't. If you want, I posted a slightly longer comparison to c.s.m.p. about a month ago:
http://groups.google.com/group/comp.sys.mac.programmer.help/browse_frm/thread/3db9a78006675e0f/06438b089d491aeb
The latest RubyOSA has addressed some of the easier issues since then (keyword arguments, osax and remote scripting support), but the rest still stand.
HTH
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