This isn’t your typical “startup ran out of money” story. Rael Dornfest, the brains behind Values of n, accepted a fulltime job with Twitter. Rather than pass the web apps on to someone else or keep them going under Twitter’s roof, the services will just go away, leaving their user base high and dry.

While I’m happy for Mr. Dornfest and I’m looking forward to seeing how Twitter improves with the infusion of his technology and expertise, this should serve as another wake-up call to all who rely on free services by small companies. Often labors of love built during off hours, there’s nothing to stop developers from moving in other directions on short notice.

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I am finding that many of the more popular web services have recognized that Twitter is becoming a communication hub of sorts. This leads to some great connection functionality built right into their apps that lets users get at their data from within Twitter. If you’re spending quite a bit of time in a Twitter client anyway, having the ability to quickly access or add to your info without needing to load another app can be significant.

So here are some of my favorite, or otherwise notable, applications that let me tweak every last bit of productivity I can from my Twitter time.

Toodledo – My task manager of choice has outstanding Twitter integration. I can add and retrieve tasks via SMS or any Twitter client, as well as receive reminders the same way. This is particularly handy when people tweet something that requires me to follow up or is something that I may want to revisit later. With a quick copy / paste I can retweet an item right to my to do list.

Remember The Milk – Another favorite to-do list also offers considerable Twitter support among its many features. Their functionality appears to be as rich as Toodledo, if not even more so.

Joint Contact – Aliza shared her thoughts about Joint Contact and their Twitter integration back in July. It seems like such a logical feature for this type of application, I am really surprised that similar functionality hasn’t made it’s way into other Project Management and Collaboration tools like Basecamp.

I Want Sandy – It’s not surprising that Sandy is so handy at using Twitter as the whole application is geared towards getting information to and fro quickly and easily. Twitter is just one of the many remote data integrations available.

Twittercal – It’s a third party tool that allows you to easily create events on your Google Calendar via a Direct Message. I like that it uses Google Authorization methods and doesn’t require my Google password. I wish it would allow me to add things to more than my default calendar though. As of now, I need to go in and manually edit most of them (which does sort of defeat the purpose…) Admittedly, this is apparently a limitation for Google’s own SMS integration as well.

I found the majority of these integration solutions to be quite robust. The syntax required can sometimes be a bit cryptic but taking the time to learn and master it can really be a productivity booster.

Does your favorite app work with Twitter? What service do you think would benefit most from this type of functionality?

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• The Near-Term Evolution of Social Commerce
• A 2011 Connected Consumer Forecast
• A 2011 NewNet Forecast