So what are they?  - Beyond the typical corporate applications I use (Exchange, Communicator Mobile, Office Mobile etc...) My current favourite applications are:

 

1) Guitar Hero III - a great game to play on your device - http://www.winplay.com/game/GuitarHeroMobile

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2) Intelligolf - Excellent application for keeping track of your golf games - www.intelligolf.com

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3) Hexic - a hugely addictive game (be warned) - http://www.astraware.com/all/hexic 

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4) SPB Mobile Shell - Everyone likes modifying their device - http://www.spbsoftwarehouse.com/products/mobileshell/?en 

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5) Suduko - I got hooked on Sudoku a long time ago.... http://www.astraware.com/ppc/featured/sudoku/?skucode=0047-000-0379

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6) Sports Do - if you are a runner, cyclist or skier (or other sports too) - this is a great application for tracking your progress.  I use this when I go snowboarding - very cool to see your routes on Virtual Earth! - http://www.sportsdo.net/

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7) Pocket Informant 8 - this is a great add on to Outlook Mobile for those who want more powerful calendaring and organisational capabilities - http://www.pocketinformant.com/products_info.php?p_id=pi&

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8) Sling player Mobile - A Slingplayer allows you to view your TV from your laptop or PC.  Sling player mobile allows you to do the same thing from your mobile device.  You can even control your home satellite or other source from your device! - http://www.slingmedia.com/go/spm-features

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9) Live Search - this is a fabulous application actually written by Microsoft that allows you to connect to a wide variety of web services to get mapping information, local information such as restaurants and other services, gas prices, traffic and weather.  http://wls.live.com

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10) SPB Insight - I've tried a wide variety of RSS readers but this is the one I always end up back using - http://www.spbsoftwarehouse.com/products/insight/?en 

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11) SPB Brain Evolution - Train your brain! - http://www.spbsoftwarehouse.com/products/brainevolution/?en 

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12) Handstep Team Calendar - This application allows you to view multiple calendars on your mobile device and even schedule time with multiple people within your organisation! - http://www.teamcalendar.com/

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Feel free to post your thoughts on your favourite applications for Windows Mobile!