No they won't, the NI ceiling is being raised which will significantly hit people earning over 35k.
Anyone earning over 37.5k will pay 390 more in NI in 2008/9, and anyone earning over 43k will pay about 900 more in NI in 2009/10 than now. Although people earning over 43k will save 160 in tax by the over-indexing of the higher rate band, as well as the 400 odd as per above - but they'll still be significanly worse off overall. Something people seem to have missed.
Well they are sort of - by aligning the HRT threshold with the NI UEL. Effectively there will be 2 tax bands as above, except for people who don't pay NI (pensioners, idle rich living off divis etc).