"If had to share one tip - (only one per person!) with a colleague who
was
just about to plan a new project that included some aspect of online
activity - what would it be?"

My one tip would be to not assume that everyone will have the same
level of knowledge and expertise about computers, web and email
functions. To be clear on where people are coming from -I would do
some evaluation before hand of people's skills and knowledge as well
as the computer capability- i.e. what version of Netscape or IE do
they have? does their email provider allow attachments and how big. is
their computer at work or at home- do they share the line with the
phone?

I have others like --be clear about the objectives and also be clear
about what success means for you, like what would you look for 3
months or one year down the line that would tell you that you've
succeeded. what does that look like.

Peace to you.