Abiword
Firefox 
Are you sure you aren't talking about PdaXrom : nothing to do with cacko .
i'm also using cacko beta1 for c3000 and it's stable. i've been using it for almost 3 months now and it never froze. i'm running X/QT (previously installed by hand and currently with meanie's jumbo xqt which is really a great improvement for X installation).
I'm running kopi and kapi, using konsole and modifying pictures with Gimp.
My wifi card (Asus WL-110) works fine (freebox at home).
well on the other side i agree that i could have waited for the C3100 if i had known it would come out... well maybe not... my C3000 is the best PDA i've ever had
loran
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I agree with you that 'Zaurus' are the best PDA, but IFAIK (due to the fact that I owned a 6000 and a C860 before), the c3000 is not the most well finished PDA from Sharp.
The launch of the c3100, just after c3000 shows that Sharp wanted to 'repair an error'.
I'll tell you a story later, but it is not the moment yet
P.S : My wifi card (Asus also) works fine (also, Livebox at home) : finer with the c860, because sometimes the c3000 freezes my Livebox