The present study investigates the effects of using weblogs on the professional development of EFL supervisors and teachers in Oman. The sample of this study consisted of 41 participants ( 4 supervisors and 36 teachers) in the Dahirah region during the academic year 2009-2010. This study was a quasi-experimental one-group study design. A comparison between the results was made before and after the use of weblogs. A questionnaire was designed to answer the four questions of this study. The first part of the questionnaire focused on finding out to what extent do weblogs increase communication between supervisors and teachers. The second part focused on finding out to what extent do weblogs enhance teachers' training chances. Revealing the attitudes of the participants was the focus of the third part and the fourth part highlighted the problems which the participants encountered. The statistical analysis of the data revealed the following findings: 1. The results of the questionnaire revealed an increase in the perceived quantity of communication between supervisors and teachers after using weblogs. This indicates that weblogs were effective in this regard. 2. The results also revealed that weblogs enhanced the perceived quality of teachers' training opportunities. 3. The attitudes of the participants remained the same before and after the use of weblogs. 4. 14 problems were reported by participants, but lack of time and no or limited Internet coverage were the main ones. These findings have led the researcher to list a number of recommendations for future weblogs studies.