Windows Phone 7 has 10 different input panels to choose from:
Default (Standard QWERTY Keyboard)
Text (Standard text with sugestions and autocorrection)
Url (URL Address)
EmailSmtpAddress (Email Address)
EmailNameOrAddress (Email name or address)
Maps (Map Localization search)
TelephoneNumer (Telephone number)
Search (Search Query)
NameOrPhoneNumber (SMS Contact search)
Chat (Text input with intelligent features like text abreviation)
The use is very simple, on your textbox XAML definition specify the SIP you want to use:
<TextBox Text="http://jyeray.blogspot.com">
<TextBox.InputScope>
<InputScope>
<InputScopeName NameValue="Url" />
</InputScope>
</TextBox.InputScope>
</TextBox>