  We look at the impact of Infra-Red (IR) and radio point sources on upcoming
large yield Sunyaev-Zel'dovich (SZ) cluster surveys such as APEX, SPT and ACT.
The IR and radio point source counts are based on observations by the the SCUBA
and WMAP instruments respectively. We show that the contributions from IR
source counts, when extrapolated from the SCUBA frequency of 350GHz to the
operating frequencies of these surveys (~100-300GHz), can be a significant
source of additional `noise' which needs to be accounted for in order to
extract the optimal science from these surveys. Alternatively, these surveys
give us an opportunity to study IR sources, their numbers and clustering
properties, opening a new window to the high redshift universe. For the radio
point sources, the contribution depends on a more uncertain extrapolation from
40GHz but is comparable to the IR near 200GHz. However, the radio signal may be
correlated with clusters of galaxies and have a disproportionately larger
effect.
