My data is now commingled with another small income stream (plus my time offset is extreme for most @ GMT+9)   However, I think that suchmoon has been doing a great job of recording the daily yields in his thread and spreadsheet.   https://bitcointalk.org/index.php?topic=514242.0

I will say that right now our yield is pretty much as low as I've seen.   1 KHS yielding about .000004 btc currently.   That will probably vary though out the day, but right now that is pretty low.  

The flipside is right now KHS is also extremely cheap even as low as .00085 btc per KHS.   ( < $.40 / KHS)

Currently some ASIC hardware/cloud combo can ordered by about $0.113.  (ZeusMining Bizzard)   However that is prepay not to be shipped for a month.  

My belief is that many coins will give up on scrypt and scrypt yields will continue to sink.  Then we should see an improvement in yield.   How low or how high I don't have any idea, but the big advantage of scrypt.cc (Scc) is that they are mining for themselves and probably want the yield as high as possible too.

EDIT - Yield by KHS from suchmoon's data
 
                    BTC / KHS
5/1/2014      0.00483865
4/30/2014    0.00551926
4/29/2014    0.00637223
4/28/2014    0.00575257
4/27/2014    0.00627888
4/26/2014    0.00569182
4/25/2014    0.00706295
4/24/2014    0.00741519
4/23/2014    0.00729475
4/22/2014    0.01077762  <-- This point was probably inflated by the Easter gift script (each account got .003 btc).   Should be .00777762
4/21/2014    0.00712663
4/20/2014    0.00753195
4/19/2014    0.00714063
4/18/2014    0.00737194
4/17/2014    0.00747421
4/16/2014    0.00727083
4/15/2014    0.00674545
4/14/2014    0.00547317
4/13/2014    0.00625852
4/12/2014    0.00703569
4/11/2014    0.00637944