You are not the only one and this problem is not limited to Skype.
smorior83, Could you verify that Visual Voicemail also incorrectly routes audio through your speakerphone speaker as well? If so, then I suspect the HD7 hardware. Visual Voicemail (I'm on T-Mobile) has a speakerphone on/off button but it does not toggle between lcd-side speaker and camera-side speakerphone speaker for me.
Skype has the same problem for HD7 owners. We call a contact and the other person's voice is routed through the camera-side speakerphone speaker rather than the lcd-side ear speaker.
I have logged an issue with HTC http://community.htc.com/na/htc-forums/windows-pho
Can Skype Tech Suppport verify that this problem is unique to the HD7 hardware? Are all other handsets routing the audio correctly to the lcd-side ear speaker? Thanks.
My numbers ------------
Carrier: T-Mobile USA
Hardware Revision: 0002
Bootloader version: 5.12.2250.0(135916)
Chip SOC version: 188.8.131.52
Skype version: 184.108.40.206