Here's some great arguments in favour of home working.
Cash Savings
According to Telework Research Network's businesses that let employees work from home half the time save £6.6k per employee yearly & shed load of carbon. For 150 employee's thats nearly £1m. Most of that is improved productivity and less sick time, but 30% of the saving is cold hard cash, electricity, office space, maintenance etc.
The employee’s save up to £4k each as well. Side benefits not mentioned include happier people and you always get the amazon deliveries when you want them! Full article: http://www.businessgreen.com/business-green/news/2266043/telecommuting-saves-companies
Work Time benefits
Stegmeier Consulting Group's 10-year research study published lots of work time benefits
My favourite benefits?
(The Top Benefits of a Workshifting Policy - http://www.workshifting.com/2010/03/the-top-benefits-of-a-worshifting-policy.html)
Carbon benefits
By working from home half the time, a US worker would save on average $362/year, and save 53 Million metric tons of greenhouse gas. A great summary of benefits (US Biased, in glorious pictures): http://undress4success.com/telecommuting-makes-cents-2/
Got any other interesting research out there?