  We present evidence for the b -> d penguin-dominated decays B+ -> K0barK+ and
B0 -> K0K0bar with significances of 3.5 and 4.5 standard deviations,
respectively. The results are based on a sample of 227 million Y(4S) -> BBbar
decays collected with the BaBar detector at the PEP-II asymmetric-energy e+e-
collider at SLAC. We measure the branching fractions Br(B+ -> K0barK+) = (1.5
+- 0.5 +- 0.1) x 10^{-6} (< 2.4 x 10^{-6}) and Br(B0 -> K0K0bar) =
(1.19^{+0.40}_{-0.35} +- 0.13) x 10^{-6}, where the uncertainties are
statistical and systematic, respectively, and the upper limit on the branching
fraction for K0barK+ is at the 90% confidence level. We also present improved
measurements of the charge-averaged branching fraction Br(B+ -> K0pi+) = (26.0
+- 1.3 +- 1.0) x 10^{-6} and CP-violating charge asymmetry A_CP(K0pi+) = -0.09
+- 0.05 +- 0.01, where the uncertainties are statistical and systematic,
respectively.
