The recent surveys shows that the Mobile net growth is growing eight times faster than PC-based access.
Keeping this in mind, most of the leading company’s has been started developing mobile applications to provide access to their services even on the move.
Here is a list of most popular mobile applications that are currently ruling the mobile world.The best thing about these applications are they are all available for absolutely free.
Image by miss karen via FlickrOperaMini – The most popular mobile phone browser is currently ruling the world.Opera Mini 
gives you the full Web experience on your mobile phone. Opera Mini is a web browser designed primarily for mobile phones, but also for smartphones and personal digital assistants.
Gmail For Mobile – Google has released Gmail Mobile, a new cell phone client application, for everyone’s favorite web-based email service. You can also check the detailed review of this very nice application here.
Google Maps -Download Google Maps for mobile to your phone, and never carry a paper map again. Google Maps on your phone makes it easy to find your directions.
Fring – By using this popular mobile app you can Make free mobile calls.You can do IM with Skype, MSN Messenger, ICQ, Google Talk, SIP and Twitter Contacts. Fring is the only pc independent peer-to-peer mobile VoIP service.It enables you to make free VoIP calls from your 3G cellular phone.
Skype – With Skype on your mobile, you’ll always know when your friends are online and you can call them for the cost of a local call.
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Word on Pocket Express. I keep up with my teams
You should add Pocket Express as a means of getting news and other well-organized information on the go without lots of explicit downloading of useless extraneous stuff.
thanks Romout, all the links are corrected now…
Please fix the links – You forgot the url protocol for all but the google-links
I agree with Chris – why paying for Skype-Skype calls using Skype if Fring can be used totally for free? Also Fring covers several services as protocols.
I described that there:
http://dobrzanski.net/2009/04/07/skype-for-free-on-nokia-e51-mobile-with-fring/
I see Skype redundant to Fring as Fring covers the Skype calling + way more..
There should be some LBS app in this list, something like Zhiing, Where, or Urbanspoon.