My tip focuses on MS Outlook. As email communications, calendar appointment scheduling and tasks have increased, I realized it was a necessity for me to try and do things quicker.
Here is an easy tip... When an email comes in, you can click and drag the email address to your calendar, contacts, tasks or notes icon and it'll bring in the email content automatically for you. This way, you can save time from having to copy and paste all the time. For me, I've saved a lot of time by dragging/dropping directly to my calendar and task icons.
Also, to keep up with the many ongoing happenings within DL, I try to stay connected by skimming through my Google Reader daily. This tool has really made compiling all my blog feed interests nicely.