Information from earlier than 2007 won't be the best information for the current impact of women bloggers. While some information pre-07 may prove useful to see how a blogger or website has developed as a resource, it's not the best way to find out what's happening in current political arenas. As far as looking for information relating to what women are writing now and what they're doing to influence the current election and political climate, I need websites that provide the most current and up to date information.
Studies that examine historical data can prove useful for studying trends over time. But information needs to be updated to include statistics from recent events. I've already found one international women's rights group that stopped publishing in 2005. Some of the information on that site might still be relevant in that it was pertinent at that point in time. However, the two year time gap is significant in that much has happened politically - both domestically and abroad - in that time period.
Out-dated material, posts, studies, discussions can be useful for background research. Current materials provide the most relevant picture of the impact women are having on today's political landscape.