I am one of those weird people who like office products, and I love Zebra's SARASA Gel Pens. They are better than any I've tried. One day in the middle of a college economics class, my professor asked me if he could borrow a pen. I handed him one of my SARASA Gel Pens, and he paused class for a few moments to tell me how wonderful it is and ask me where he could buy some.
SARASA Gel Pens write extremely smoothly. They are reliable and don't get those frustrating air bubbles that make many gel pens stop writing when there is still ink in them. You can buy them in packs of all black, all blue, or a fun rainbow of colors for variety. They are also acid-free and of archival quality, which makes them useful for scrapbooking as well as everyday use. These gel pens are comfortable to write with and come in three sizes: fine, medium, and bold points.
The one drawback is that SARASA Gel Pens are not the most widely available. I've only found them at Staples and Sam's Club (cheaper, of course), though they are sold on a number of websites.