For such a simple task I'd just use Excel (or OpenOffice Calc). It has the advantage of being able to email the spreadsheet to committee members, with each of them being able to view it without needing to have the same specialist accounting program on their computers that you'd have on yours (if you opted to use such a program).
If you insist on having an accounting program, GnuCash is popular:
http://www.gnucash.org/



