In yet another full-blown promotion to entice you to register online, Northwest WorldPerks is offering another 1,000 bonus miles through Aug. 31 if you register to receive promotional email. The first 500 bonus miles are for new signups, and members who remain registered through Oct. 31 will be rewarded with yet another 500 bonus miles. For those of you who have already registered, don’t worry. Current registered members who go online and modify or add information to their profile using the new online form will be eligible for an additional 1,000 bonus miles. It appears that there are enough miles for everyone — but don’t delay past the Aug. 31 deadline. Warning: if you’re looking for an instant addition to your mileage account, this may not be the answer — posting to your account can take four to six weeks.