Here is a picture of the Skype device I mentioned earlier, can be had for a measley $20 on Ebay, I have a similar product, when a skype call arrives it rings my regular cordless phone, as do regular PSTN calls. To dial a skype speed dial number I simply prefix with ##. The advertising blurb says cordless phones, but the interface is POTS (Plain Old Telephone) so it will work with any home telephone. Some models (Not this one though but Search Ebay for Infoserver) can be set to call forward incoming Skype calls back out via your regular telephone line to your Mobile phone.
The hard sell.... Manual can be D/L
here
Works flawlessly with Vonage, Skype, MSN, Yahoo Messenger, VoipBuster, VoipCheap.
Specification:Support DECT, 2.4G, 900M and any other wireless phones.
Make/Receive both Skype/VoIP calls and regular PSTN calls
Auto-detection and auto-switch between Skype and PSTN calls
Phone rings for all incoming VoIP Skype and PSTN regular phone calls
Switch between Skype or PSTN calls by pressing the (*) on the phone
Dial out Skype call using regular phone keypads
USB and PSTN line LED indicator
Driver and sound card built-in, no external power required
PC-to-PC, PC-to-phone, Phone to Phone operation
Compact size, Metallic Look & Feel casing
System Requirements :Windows 2000, XP or Vista
400 MHz processor and free USB1.1 or USB2.0 port
128 MB RAM and 15 MB free disk space
Internet Connection (33.6 Kbps modem, or any broadband: cable, ADSL)