I know I can use the RODBC library for accessing excel (.xls) docs from within Windows, but is there something similar for the Numbers program that come with iWorks? If not, what other solutions are there for easily editing a spreadsheet (like a lookup table) and accessing it within R? I know there the is an internal R editor, but I don't like it very much.
One alternative option you could consider is using Google spreadsheets. You can then access the data from either RGoogleDocs or RGoogleData.