In this paper, we review the technological foundations of the current Blogosphere. The review is primarily based on a largescale evaluation of active blogs. The extensive list of examined technologies enables commenting on a range of widely adopted standards and potential trends in the Blogosphere. The evaluation has been conducted in the following stages:1. Retrieving and parsing a large set of blogs 2. Identifying and quantifying the use of technologies such as web standards, adopted services, file formats and platforms. 3. Analysing collected data and reporting the results 4. Comparing the results with existing findings from the generic Web to identify similarities and differences in the Blogosphere. The presented work was performed as part of BlogForever (ICT No. 269963), an EC funded research project aiming to aggregate, preserve, manage and disseminate blogs. The results of this study are relevant within the context weblog preservation and weblog data extraction.