I subscribed to the Annual during its first year. There were some new symbol sets there, but they were each in a different style. Some of the new styles were quite compatible with the stock symbols, and some did not match at all.
You can browse through each issue of the Annual to see what it includes. The pics will give you an idea of what the included symbols look like, and the list at the bottom of the page tells you how many (if any) symbols are included in that issue. Of course, if you buy an Annual subscription or back-volume, you'll get every issue from that year—you can't cherry-pick which issues you want.
There aren't a whole lot of other resources for world map symbols, but there have been several brush packs and map objects posted here in the Mapping Elements forum that are useful. They're typically in PNG format so they can be used in most every program.
If you ever do battlemat-scale maps, though, the Dundjinni User Creation forums are a goldmine.