Speaking on behalf of my gender, the man in your life would love flowers or chocolates tomorrow. But since we have our gender roles to play (and this is a tech site), any one of my Products of the Year or one of these male-appropriate gadgets would make great "I love you" Valentine's Day gifts.
Is your loved one switching from a BlackBerry to an iPhone – but he's worried about not having a physical keyboard? Problem solved with this iPhone 4/4S Nuu case from Noetic, available in black or white ($80). Underneath the otherwise standard iPhone 4/4S case is a slide-out QWERTY keyboard. Since it's a wide landscape keyboard, the Nuu QWERTY is wider – and thereby easier to thumb-type – than the keyboard on any BlackBerry.