Not talked about quite as much as fee rates, but still frequently discussed is per diem rates (sometimes called daily living allowance). Perhaps per diem rates are discussed a lot because many organisations keep their rates "secret". However, below are links to helpful organisations that do publish their rates.
Australian Taxation Office reasonable travel and overtime meal allowance expense amounts for 2009-10, http://law.ato.gov.au/pdf/pbr/td2009-015.pdf
European Commission per diem rates, http://ec.europa.eu/europeaid/work/procedures/implementation/per_diems/index_en.htm
NZAID Per Diem Rates, http://www.nzaid.govt.nz/contracts/per-diems/
US Department of State Foreign Per Diem Rates by Location, http://aoprals.state.gov/web920/per_diem.asp
WHO/UN Per-diem and Stipend Rates , http://apps.who.int/bfi/tsy/PerDiem.aspx
