> What are people's experiences with mosfets (mid-power, say 100mA)
> with low to very low Vgs-threshold specs.  Is there anything well
> belog the 2.5V spec common (but no longer sufficient) for "logic
> level" devices that works well and is commonly available ?

Almost exactly what you asked for
TO92
Mouser have them fwiw

        http://www.supertex.com/pdf/datasheets/TN0702.pdf

Some possibly useful parts
Selector guide


        http://www.supertex.com/products/selector_guides/101/100

See also

        http://www.supertex.com/pdf/app_notes/AN-D2.pdf


____


Zetex make some with Vth of 1 volt or less.

Here's a semi random one (SOT23 pkg) with Vth = 1 V and useful specs 
at Vgs=2V

    http://www.zetex.com/3.0/pdf/ZXMN2A01F.pdf

Stablemate
Vth = 0.7V
But generally less good at low gate voltages

        http://www.zetex.com/3.0/pdf/ZXM61N02F.pdf 

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