I. To determine the maximum tolerated dose (MTD) of temsirolimus in combination with bortezomib, rituximab, dexamethasone in patients with relapsed Waldenstrom's macroglobulinemia and relapsed/refractory mantle cell, follicular, marginal zone or small lymphocytic lymphoma. (Phase I) II. To evaluate whether the addition of temsirolimus to the regimen of bortezomib, rituximab, dexamethasone improves progression-free survival in patients with previously untreated or relapsed Waldenstrom's macroglobulinemia. (Phase II)