I run a web design business, in my team, I have two designers and two coders, and I'm the project manager, cum coder, cum client servicing, cum sales, cum making sure my staffs are happy by making available a system that makes their life easier (such as the use of activeCollab).

Let me explain how I use aC. After much trial and error, I have arrived at the following workflow.

Situation: A new project is secured
Step one: Create a company (and user if applicable)
Step two: Create a new project, and I use the project description to fill in the project brief (project objective, target audience, design requirements etc)
Step three: Add member to project
Step four: Create milestones (as project timeline) and assign members accordingly

The Milestones overview gives me a macro view of what needs to be done. And here comes the daunting part: I would start creating new tickets for things needed to be done in order to meet the milestones. But to do that, I have to travel thru and flo between Milestones and Tickets to make sure I didn't miss any details.

Having said the above, since we have to first create a Milestone, before we can link it to any checklist/ticket, how about adding the tabs in the Milestone details page, that lets us create new checklist/ticket from there, with the Milestone automatically being selected?

By the way, I use Ticket for works involving the team, and Checklist for my personal tasks (tasks that do not need a bunch of people to do) e.g. Send invoice, Collect down payment, etc.