I see in the product contents list on the support page there are several new cards in each adventure. How useful are they? Items, locations, tell me about them. Is it worth buying the adventures purely to get for the extra goodies, and to use ideas from the adventures secondary?

Also, it appears there are some orc and skaven specific cards in the adventures. What is the deal with those?

There are a fair few location cards in each adventure, and barring one or two plot specific places (hag tree), they're pretty much all useful (although some seem to cover similar ground to others released - abandoned cemetery, garden of Morr, mausoleum). In terms of items, some of these (especially in TGS) are difficult to use outside of the plot, but things like the sword Actius or the Desolate Blade (Skaven Warpstone Weapon) can easily be used again.

The settings themselves are very good. The gazeteers of Stromdorf and Ubersreik are full of interesting locations which give you plenty of hooks to build your own adventures into the two towns. Even if, as with my group, your PC's are run out of Stromdorf, you can still use NPC's and locations elsewhere.

In terms of monster actions, both adventures include actions for their bad guys. In TGS this is spells for a Beastmen Shaman, a Necromancer and a Goblin Shaman. In EON this is spells and one other action for a Skaven Grey Seer along with some Skaven specific items. In the books there's also creature stats and creature actions which add variety to what is in the Tome of Adventure. All this stuff is very useful, however I'd imagine the info on monsters becomes a bit less useful if you get the Creature Guide and Vault that are coming out.

Overall I'd say that for me, given that I'm running the adventures themselves, EON has more long term use than TGS, although much of my reasoning comes from the fact that my PC's are based in Ubersreik and aren't likely to return to Stromdorf anytime soon. I also think that EON has easily more transferable ideas in it - noble favour, rumour checks, brief corruption and mutation rules (if you haven't got Winds of Magic) - and more generic locations (given that its a large town). TGS main strength if you're not running the adventure, is the variety of enemies, but with the arrival of the Creaturer Guide and Vault that becomes less of a bonus.

Hope this helps

That certainly does help. Thank you. Since I have the creature guide pre-ordered, it seems TGS is of less use.