What set of utilities and services (online or offline) do you use to manage your startup? There are obviously many possible needs, like book-keeping, private and secure sharing and backing up of files, communication between co-founders and partners, customer care and ticket handling, etc... I'm not clueless about these subjects, but I'd like to hear what the HN community recommends.
Just to mention, Microsoft office offers some pretty nifty services in this regard. Check out Office Live Small Business. You get a workspace with 5Gb of file storage. You can view docs, ppts right in the browser and with a plugin you can edit them right on your desktop MS office.
There's also Live Mesh service (seperate 5 GB) that allows you to sync files across different computers. You can use it as a documentation, file sharing tool.
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We have a Team of 5. We started with a google based solution for now.
Give a try on CurdBee (http://curdbee.com) for invoicing and billing. It would fit perfectly for your startup if you are looking for a smart and low cost solution (you can start using it for Free!)
I am a single programmer startup. Still working on my website.
TortoiseSVN (source control) is the only thing I am using as of now.
I have a to-do.txt in my desktop to remind me of what next. I use Gmail to communicate and StackOverflow to get help. Since I haven't completed building my application, I never needed other services to manage the work.