http://forum.ppcgeeks.com

If your comfortable flashing your expensive phone (and risking turning it into a brick), these unofficial ROMs that appear to be built off of leaked 6.5 bits are awesome.  6.1 was a decent upgrade but 6.5 is so much better.  Plus, it removes all the bloatware from the phone provider.  The new Today screen UI is fantastic and while still not perfect, it can mostly be done via just a finger instead of having to use the stylus.  I look forward to the official release version (and hope it'll be available for my model) and I really can't wait for WinMo 7 to come out.

www.mesh.com

Live Mesh provides a great way to sync up files across multiple PCs and a WinMo phone.  I use it to sync up my cameraphone pics to my PC as well as some other docs and my software folder.  It works as a nice backup utility as well.

http://www.microsoft.com/windowsmobile/en-us/downloads/facebook.mspx

Can't forget the most popular social network site.  While limited in some areas, this app makes it easy to upload pics and even video directly to my facebook account, read my friends status updates and make my own status update.

http://www.discoverbing.com/mobile/

Maps, Directions, directory, weather and traffic.  All in one application.  The map could be a little better and as you'll see, I also use Google Maps.  But for different reasons.  Bing Maps I find has a better driving map when I've plugged in and address and asked for directions.  Its easier for me to read the next turn and if I stray from the suggested route, it will ask if it should reroute from my current GPS location.  Google Maps does not.  The speak to search capability is pretty decent as well.

http://www.google.com/mobile

If I just need to see quickly where I'm at, this is a great app.  It's good for walking directions and even directions using mass transit (came in quite handy on a vacation to Hawaii in June).  I prefer Bing Maps for driving directions though as G Maps doesn't display very well the next street I'm looking to turn on or offer to reroute my directions if I miss a turn.  What I'd really like to see though is a downloadable mapping solution.  Something that stores locally and only uses the GPS, because on the long distance drives or when I'm hiking, I will quite often be out of my data network. 

http://www.nicque.com/pqz/GCz.htm 

My hats off to this independent developer.  I had been waiting for a WinMo application that would allow me to look up Geocaches, find them using the phone's GPS and then log them all from one app.  This one does it all and its freeware.  I've been out a few times geocaching with this app.

http://www.microsoft.com/windowsmobile/en-us/totalaccess/software/software/netflix.mspx

Does just what you think it does, lets you manage your Netflix queue from your phone.

http://www.windowsliveformobile.com/en-us/windowsmobile/default.aspx?ocid=WMTAFeaturedDownloadsPC

IM on your Messenger account and check your Live Mail/Hotmail account in WinMo Outlook app with this handy app.

I've tried these apps but don't have much reason to use them.  But I do find them interesting.

http://qik.com/

Need people to see what you are doing right this second or just want to quickly capture post a video to the web?  Qik will do it for you.

http://www.microsoft.com/tag

I'm not sure how widespread this is on retail goods yet and there are many other apps like this, but its basically like a barcode that when the app sees via your cameraphone, it takes you to a website automatically that could have a download link, more info about the product, etc.  I have a few different apps like this on my phone but until there's a standard that all companies adhere to and that has an app across multiple platforms, this isn't very useful.  I believe there might even be some applications that can determine what the item is from its barcode and will then find it on a site like Amazon.  I only used it briefly and recall it being somewhat buggy.  If I find a good one thats somewhat universal, I'll add it here.

 

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As you'll notice, most of the apps above are free.  There's lots of freeware out there.  Many of the apps I've seen to buy haven't been compelling enough to spend money on them.  I hope that with Windows Marketplace, the prices become more reasonable as they seem to be for the iPhone.  As in $10 or less for most of them.  Many of the interesting apps I've seen for pay seem to be around $20 which, without a real compelling reason, is going to drive me away.

This list will be updated as I find new apps that I find useful and/or interesting.  Have a favorite WinMo app not in the list?  Please post it in my comments.