Hand-holding has been proven to reduce stress so those of you who can, hold hands for at least five minutes today. Hand holding is an accepted form of PDA and can be done in almost any situation so there is no excuse!
For long distance couples like me and Heidi, you are going to put technology to work. Here are some very comprehensive lists of emoticons (1, 2, 3) that you can reference. Throughout the day, text your partner emoticons that show how you feel about him/her.