IBM is to rename all its servers tomorrow, under the blanket moniker - eserver.
The Netfinity line will become eserver xSeries; the S/390 changes to eserver zSeries 900; the AS/400 will become the eserver iSeries 400; and the RS/600 will become the eserver pSeries 600.
IBM is also expected to announce an updated version of the S/390, sorry - eserver zSeries900 - with 64-bit support. ®