What project collaboration tools do you recommend for maintaining tasks, bugs, collaborating, messaging, storing files, wiki, etc?
I had a look at Remember The Milk, but not sure if it's ideal! Backpack looks good and reasonably priced; has anyone used it?
Depending on the size of you team (and other factors) a combination of Subversion & BugZilla might suffice.
Of course, Microsoft swears by it's VS Team Systems (haven't used it as the price tag is prohibitive)
I've used unfuddle which is quite good. It has a ticket based workflow along with git and subversion hosting. A single project account is free, with payed accounts being charged by number of projects and amount of storage space used.
The Atlassian products are great but not cheap.
Pair this with Google App
And you're rolling.
I would personally look into Mindtouch's products. There are even extensions/plugins that are suited to software development teams.
I've heard of a few teams that use Basecamp, but I've always just used Trac. Trac is opensource and has a decent API for extensions.
Lighthouse is awesome if you want a hosted solution. It's basically the same as Basecamp, except with a software development focus.
I find it nice to have one web based project management tool in which I can get an overview of everything related to the project(s). This includes user (developer) administration, wiki, repository and most importantly time tracking with road mapping.
Redmine does the job for me.
And I normally use a git repository with it. It can be a wee bit difficult to set up on your web server but I found that it was worth the effort.
There's also related questions on stackoverflow like Project tracking/management tool.
Good luck.
The best I've used so far is SmartSheet (www.smartsheet.com) - I feel like one of those TV salesmen...spreadsheet like interface, stores all size files (and file versions), allows for discussions, alerts and reminders. Very flexible and easy to use.