I mostly keg. But I tend to bottle about 18 from each batch. I save 6 for long term storage and the other 12 are for those occasions where nothing you have on tap looks good to you.
In the past I have used Cooper's Carbonation Drops which have worked great for me. No complaints about the Cooper's.
Link to Cooper's:
Cooper's Carbonation Drops :: Midwest Supplies Homebrewing and Winemaking Supplies
Then I noticed that my LHBS had Munton's CarbTabs and they were cheaper.
Link to Munton's:
Munton's CarbTabs :: Midwest Supplies Homebrewing and Winemaking Supplies
Munton's CarbTabs suck! I thought that having small tabs would be a plus. I thought, "Hey i can really dial in the level of carbonation very easily."
But once you start counting out the 2-5 tabs you notice that fully half of them have are missing large chunks. Thus making your exact "dialing in" very difficult.
But the biggest problem is they take forever to prime your beer. The Honey American Pale Ale i bottled on 12/13/08 still has solids floating on the top a month and a half later. I have several other beers with the same problem but they were bottled 2 weeks later.
These solids, which are clearly little white pieces of the priming tabs, they may be the heading powder that comes in the Munton's that has yet to dissolve. I do not know anything about heading powder.
Either I am switching back to Cooper's or I am going to have to measure out about 2 gallons of beer and measure out the right amount of sugar.