The greatest thing about the web has to be the masses of great information you can access - for free.
I subscribe to several great newsletters and updates and I get great ideas from these all the time. So don't get too insular about you're day-to-day job. Make sure you allocate half an hour each day to checking out what other's are up to.
My real faves at the moment:
For some DM hints:
For some copywriting ideas:
Let me know if you have any that should be added to the list!
It's also great to get some more fun mails to see what clever and groovy people are doing. Check out:
Image courtesty of: http://floppycheese.free.fr/timsroom/style-5/style-5.htm