Here are 5 applications for your Windows Mobile Smartphone:

Live Messenger - If you add Encarta@botmetro.net to your contacts, you can ask questions and get answers from MSN Encarta. You can ask questions in plain English and the Encarta agent will try its best to interpret it and respond
Live Search for Windows Mobile - Maps, directions, [...]

The company said its software allows users to have up to five connections to the same Wi-Fi connection at a time. TapRoot is reportedly working on a free trial edition that lets users try the software with just one connection at a time. The company hopes to approach mobile providers and have them deploy [...]

Wayfinder Earth is currently in beta and uses the same maps as Wayfinder Navigator. It is currently available to download, provided you enter your mobile phone number and an email address. It also allows for navigation (Wayfinder Earth GPS) and routing (Wayfinder Earth Guide) for only 14.90 and 4.95 euros a year.
Plus, it has some [...]

First of all, this is a software to be installed on your PC but it is useful for smart-phone users too, so worth a try.
Synchronize any desktop database with BlackBerry AddressBook. Sync with Ms Access, Excel, Foxpro, MySQL or any ODBC enable database.
Read more about the features and download here

Luring the less-business-minded has taken on added urgency in light of Apple’s success with the iPhone, introduced in June, 2007.
To make Windows Mobile more appealing to the masses, Microsoft (MSFT) is trying to improve its Web browsing capabilities. On Mar. 17, Microsoft announced it has licensed Adobe (ADBE) Flash Lite, which will let Windows Mobile [...]

Add full-featured navigation to your GPS-enabled smartphone with Garmin Mobile XT. Just plug this data card into your compatible phone and start navigating. With no monthly fees, preloaded maps, turn-by-turn directions, real-time services , this easy-to-use data card has everything you need to navigate to the front door.
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SecuBox provides transparent encryption of sensitive data stored on mobile devices and their removable media cards. The software employs industry class AES 256-bit encryption to protect business-critical data, guard against data theft and help users keep secure, productive and compliant.
Read more here

As you all probably know, the software version 2.0 for the iPhone has not yet appeared but it is already unlocked
Apple’s not-yet available iPhone 2.0 software has already been cracked — before it even has shipped. At least that’s what a renegade group of developers claimed Tuesday.
The iPhone Dev Team claims to have cracked [...]

Another software that isn’t very necessary, I mean I wouldn’t call it a must have application but it is free and if you like customizations you will probably find it interesting…
Feratures:

classic finger scrolling
tapping the contact make appear a screen with contact info (photo, name, phone, sms and mail). Selecting one option launch the default compose [...]

This software isn’t such a big hit and I know why, but it is free, so it’s worth a try anyway.
Here are the features:

View your mobile screen on your desktop.
Control your mobile by using desktop keyboard and mouse.
Copy/Paste text between mobile and desktop.
Capture mobile screen.
Drag and drop files to your mobile.
Requires ActiveSync connection.

Read more here