@Nosreme: Ychig0 does make a point, although it is not as big a problem as he might stress it to be. The instability tests taken by daemons is much more deadly for them, as generally speaking they cannot rely upon the large numbers and re-/summoning abilities inherent to the TK and VC. So every time that a daemon regiment looses a model, it is going to hurt a lot more as it will have a greater effect on the CR and there is no way to bring that model back.
Also, it really depends on the type of army fielded as to whether the shooting army will have a field day. Yes, against a standard daemon list a shooty army will do well. However, the speed at which a slannesh army could skirt ranked units and hit artillery and missile troops puts woodies and druchii to shame. Alternatively, although I have not seen such a list in action yet, I would imagine that a plaguebearer-heavy army led by a herald could deal with shooting rather well with T4, a 5+ ward, and a regen. save (and on paper it looks to be impossible to kill one of those beasts of nurgle with shooting).
@Ychig0: That said, charging skinks into a unit of daemons is just going to ensure that they win combat by providing ranks that otherwise would not be able to attack WS2 T2 targets.
Having just played against the daemon army, I can confidently say that it is really difficult to come up with an effective strategy, unless one knows the heroes choices of the opponent. At 90 pts, the Masque is going to be almost ubiquitus, but beyond this the choice of heralds is going to affect what kind of army a Daemon player takes. For example, against an opponent who has taken 1-2 slannesh heralds, chariots are a necessity as the impact hits will get in before the ASF (similarly the gleaming pendent may actually be useful).
Beyond this, I have found that one general rule of thumb is that annoyance units such as flyers, chamo skinks, and fast cav. are not as useful against Daemons armies. Skull totems (which prevent march blocking) are a common sight on multiple units of juggers and bloodletters, making march blocking a great deal less effective. Similarly, the slannesh totem which only allows a charged unit to hold means that pleasureseekers can clear away a great deal of enemy flying/fast cav. I found this out the hard way as my terries were torn to pieces resulting from a 19" charge which I could not flee from.