Since I dropped out of the business of training residents, I have been actively blogging and not cranking out mindless publishable research. Here is an interesting fact. I have no doubt that far more people have read what I have written in my blog for a year and a half than ever read all of my 95 published works combined.
Sing it brother! It takes me about a hundred hours to prepare a de-novo talk for grand rounds. I will then deliver it to an cohort of 50-80 docs with a collective GCS of 10. After the last audience question the lecture video will be filed in the medical library never to be found again. The lecture is not searchable or discoverable and the work is largely lost.
An average post at PBFluids will get more views than the grand rounds in the first few days and if it is linked by RenalWeb other aggregator it will get enough page views to fill one of the great conference halls of the national meetings. After the first week the post continues to be an eternal flame of searchable and discoverable data. To me the relative impact tips way toward blogging as a more significant form of academic communication but to the powers that grant career advancement it is a meaningless toy.