Thanks to everyone who lent me a hand with this.  There's just a couple of questions left, as I have compiled all the responses:
 
- The introduction to Zoega which is online (but not in the printed book) doesn't gloss e-n, although it uses it. Hmmm?
- The online intro says that e-u is for accusative, but llama_nom says it's for neuter dative.  Is this a discrepancy?
 
   Again, thanks.  Your condensed replies are now on a sticky note over my desk!
 
    Alec
 
 
 
In a message dated 1/7/2010 6:03:02 A.M. Pacific Standard Time, 600cell@... writes:
 

--- In norse_course@ yahoogroups. com, "llama_nom" <600cell@... > wrote:
>
> > e-t einhvert.
>
> That should be <eitthvert> "something" (neuter nominative, accusative).

I should say, rather, <eitthvat> "something" (something), and <eitthvert> "some, one" (when used as an adjective).

Þat var eitthvert sumar, er Þorsteinn reið til alþingis...
"It happened one summer, when Þorsteinn rode to the Althingi..."

ok muni hann hafa eitthvat illt í sinni
"and he must have something bad in mind"

Hann mælir at eitthvat muni undir þessu blíðlæti búa
"He says that there must be something behind this display of affection"