In our feature on using your computer and the internet to help you in the garden, we mentioned the BBC gardening website and the Royal Horticultural Society site as excellent all-in-one resources for all your gardening needs.
The Garden Forum hosts many discussions and newsgroups on gardening, as does Carry On Gardening, which also has an excellent links page for manufacturers of gardening equipment. Alternatively, try shopping giants B&Q and Homebase, while for city dwellers, the Urban Garden site is designed just for you. There are many gardening services online depending on your area – Londoners should consider Grandscapes.
In terms of online audio content, listen to the most recent BBC Radio 4 Gardener’s Question Time, access the Wiggle podcast or search for further podcasts at Apple’s iTunes Music Store.

Finally, here's a lsit of gardening software mentioned:
Complete Gardens: www.complete-gardens.co.uk
Geoff Hamilton 3D Garden Designer: www.gsponline.co.uk
Geoff Hamilton plant encyclopaedia: www.gsponline.co.uk
Growing plants encyclopaedia: www.fasttrak.co.uk
Your Garden encyclopaedia: www.focusmm.co.uk
Master Landscape: www.fasttrak.co.uk