Cubic Telecom were not acquired. It would have been big news here in Ireland if they had been. You can see from the founder's blog that they actually just partnered with Global Roaming: http://patphelan.net/cubic-telecom-and-global-roaming-allign...
If anything, it seems like they have completely lost focus on their original, supposedly revolutionary offering and instead fallen back on roaming SIM cards (not so exciting).
Their Crunchbase profile incorrectly states they were acquired (how convenient) and the ostensible acquisition value is oddly similar to the total amount of capital they've raised: http://www.crunchbase.com/company/cubictelecom
I don't think Powerset got acquired because of their TC50 appearance. :)
I also don't think series A, B, Q or Z funding should be a measure of success.
powerset acquired $100mm 7/08
cubic telecom acquired $6mm 1/08
viewdle additional funding 3/08
yap series A $6.5mm 6/08
flock seies D $15mm 5/08
docstoc series B $3.25mm 4/08
mint series B $12mm 3/08
clickable series B $14.5mm 7/08
pubmatic series A $7mm 1/08
zocdoc series A $3mm 8/08
befunky series A $550k 6/08
flowplay series A $3.7mm 2/08
metaplace launched 3/08
woome series B $12.5mm 6/08
zivity series B $7mm 3/08
kaltura series B ?? 6/08