Last year the survey (held for the first time) had 33,000 respondents, roughly 1,700 from Australia. This year is expected to be much bigger.
This survey is particularly interesting as the raw (anonymous) data is released - allowing anyone interested in a particular segment to analyse this data in the way they choose.
This allows for significant insights into particular segments of the market which can be used for web team management and recruiting purposes.
I'd recommend that anyone in the online space in the public sector consider both completing in the survey this year and reviewing the result from last year.
This year's survey is open at http://alistapart.com/
Last year's results are at: http://alistapart.com/