For updated web benchmarking tools it's hard to beat the data offered by Fireclick. They offer a global set of web benchmarking tools broken out by week.
They provide data on: (latest estimates)
Conversion Metrics (2.1 - 2.2%)
Cart abandonment (75%)
Keyword conversion (2.5 - 3.6%)
Email conversion (3.9 to 5.6%)
Affiliate conversion (6.5 to 7.8%)
Session length (4.8 to 5.2 pages)
Session duration in minutes (2.7 to 2.6)
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