The IMRG's annual statement says etail is growing faster than ever before, and predicts online sales in the UK will reach £78bn a year by 2010.
The group says £42bn will be spent online by UK shoppers in 2007, up from £30.2bn last year, while worldwide online sales will hit £250bn this year.
Other highlights include:
860m parcels will be shipped to the UK's 26m internet shoppers; 33 each on average.
The average UK online shopper will spend £1,600.
38% of online shopping takes place outside normal shop hours, either before 9am or after 6pm, peaking between 7pm and 9pm.
UK e-commerce grew 3,500% between April 2000 and December 2006.
Internet shoppers will spend £78bn a year online by 2010 – doubling online's share of retail sales to 20%.
The £42bn figure for UK online sales is equivalent to the annual turnover of the nation's biggest retailer Tesco.
Tesco recently announced that its online sales during the year reached £1.226bn, with profits of £83.4m. The supermarket giant's sales rose by 29.2% and profits were up by 48.5% on last year.
Tesco.com now has over 850,000 regular online grocery customers ordering 250,000 orders a week.