From 2003 to 2005, studies were undertaken in four low-altitude regions of Costa Rica and one watershed of Guatemala on the importance for farmers' revenues of the sales of timber and fuel wood derived from trees in coffee agroforestry systems. In Costa Rica, the results showed that sale of timber can account for 15 to 35% of the value of coffee revenues and 13 to 25% of the total revenues accumulated over a period of 25 years depending on the tree species, length of the rotation, logging scenarios (sale of standing trees or logs) and final products derived from timber. In Guatemala, the importance of coffee and wood revenues highly depended on the location, size and management of farms. In traditionally managed farms, timber and fuel wood could represented up to 52% and 25% of the total annual revenues, respectively, whereas coffee only represented 25% for medium size farms in low altitude range of the Guatemalan watershed. In intensively managed farms, timber and fuel wood represented less than 1% of the total annual revenues for low altitude farms and less than 10% for high altitude farms. In both countries, the commodity chains were found to be poorly organized with an absence of agreements and little cooperation among stakeholders. It was clearly observed that farmers would benefit more by selling directly timber and/or fuel wood to wholesalers rather than to intermediaries.