This article reports on an online collaborative project between English language teachers pursuing a degree in TESL/TESOL from three universities in Malaysia--Universiti Sains Malaysia (USM), Universiti Teknologi Malaysia (UTM) and Universiti Kebangsaan Malaysia (UKM). A total of 142 teachers were involved in the study and about three to eight teachers from each university were grouped and assigned a virtual classroom in Nicenet's Internet Classroom Assistant ("www.nicenet.org") where online discussions took place. Each group's main task was to produce an online newsletter that highlights three major topics--project work in TESOL, linguistics in language teaching and learner strategies. A qualitative study was then carried out to identify the teachers' meaningful experiences in the project and how it had enriched their professional development. The data obtained from the teachers' reflective reports indicates four main facets of meaningful professional development experiences--envisioning of professional development, gaining and enhancing skills, sharing and exchanging, and socialising. (Contains 2 tables and 2 figures.)