Currently Windows Phone 8 supports only NDEF formatted NFC tags. It's not possible to NDEF format blank tags, lock or unlock existing tags.
I bought once pack of NFC tags on eBay, but they were not NDEF formatted, so I had to find a way how to format them. I found on Twitter a guy with NFC equipped Android phone and he formatted these tags for me. Windows Phones should be able to do this as well.

Access to the Light and proximity Sensors Please.

I'm developing a indoor navigation app. I Want to wp7 support get wifi strength info api.

Microsoft should expose GPS based API's that can trigger after say 5 min or 10 min departure from a specific GPS location. This would be very usefull in apps in customizing the reminders.

Wifi Connectivity API Handel's:
1. Getting List of Available WiFi Connections and Details.
2. Search for new WiFi Device.
3. Sending A File to Selected WiFi Device.
4. Sending A File through application to Application using WiFi connection.

It would be really a good idea if we could use the FindAllPeersAsync method( or something similar) to get a list of all discoverable devices within wireless range.

Mango provides a good feature to scan an image for a text. It would be great to provide a new launcher/task which uses this new existing funtionality to get a string from an image.
Otherwise we need to create our own control to scan an image and extract strings with an ocr library. I'm not happy to implement something which is already there.

Even if this API would use a webservice and needs network access, I would be fine with that.

Imagination knows no boundaries. Let's give us.

Many applications like need the Accelerometer or G-Sensor for working correctly like alarm clocks that wakes when the best sleep phase has been reached or Pedometers. But it currently only works if the Display is turned on and Lockscreen is deactivated. It would be more useful to activate this feature in Lockscreen or Low Power Mode

In Microsoft.Phone.Scheduler.Alarm Class,sound property can acess "content " file ,why can not acess isolatedStorage wave file?please open api.

In IsolatedStorage ,image file can save to local MediaLibrary,why not record wave file can not?

Hi.

Give us API to work with hardware/sensor buttons API for Volume, Back, Home, Search and Camera.

Currently i develop a game and i very dissapointed that i cant handle event from Back button (it is part of Interop), because Frame very stupid idea for game, where i cant clear history of steps that happens before.

And one more thing, give us chance to Close/Exit standart "silverlight application for wp".

Stylus input for key languages

HI, it would be great if you could include APIs for accessing the Proximity Sensor (eg: to get the exact distance from objects) and the Light Sensor as this would be really useful for me and the fellow developers. Thank you (y)

Easy access to the Bing Music API would be really useful, especially for apps with artist/song recognition. Microsoft already allow developers to use the Bing Maps API in their API, so i realy hope they consider opening up the Bing APIs for the coming Tango/Apollo dev toolsets.

It would be awesome if a future phone specs for WP would require having a depth sensor similar to what is in Kinect. We could then use an API for this to say recognize where people are from the stream coming from the camera or any number of other effects (I would love to be able to create tilt-shift like effects to photos).

i NEED to change my light sensor, because my phone turns black while calling and i cant disconnect my call for example