Good app for blocking incoming sms?
how can i temporarily block all messages in an ANDROID operated Dell Streak by a particular contact....
I don't think you can with the default SMS app.
The 2 best alternatives, HandCent SMS & GoSMS offer a feature called blacklisting - you can long-press hold a conversation and choose to add it to your blacklist. Such messages will be hidden (not deleted) and you won't receive notifications / popups.
You can also configure individual notification colour and ringtone for a particular user.
Your carrier may be able to block the contact for you. For example, here is how you would do it on Verizon.