**Exhibit 31.2****CERTIFICATION**I, Michael S. Herring, certify that: 1. I have reviewed this quarterly report on Form 10-Q of Omniture, Inc. (the “Registrant”);  2. Based on my knowledge, this report does not contain any untrue statement of a material factor omit to state a material fact necessary to make the statements made, in light of thecircumstances under which such statements were made, not misleading with respect to theperiod covered by this report;  3. Based on my knowledge, the financial statements, and other financial information included inthis report, fairly present in all material respects the financial condition, results ofoperations and cash flows of the Registrant as of, and for, the periods presented in thisreport;  4. The Registrant’s other certifying officers and I are responsible for establishing andmaintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e)and 15d-15(e)) and internal control over financial reporting (as defined in Exchange ActRules 13a-15(f) and 15d-15(f)) for the Registrant and have: (a) Designed such disclosure controls andprocedures or caused such disclosurecontrols and procedures to be designedunder our supervision, to ensure thatmaterial information relating to theRegistrant, including its consolidatedsubsidiaries, is made known to us by otherswithin those entities, particularly duringthe period in which this report is beingprepared;  (b) Designed such internal control overfinancial reporting, or caused suchinternal control over financial reportingto be designed under our supervision, toprovide reasonable assurance regarding thereliability of financial reporting and thepreparation of financial statements forexternal purposes in accordance withgenerally accepted accounting principles;  (c) Evaluated the effectiveness of theRegistrant’s disclosure controls andprocedures and presented in this report ourconclusions about the effectiveness of thedisclosure controls and procedures, as ofthe end of the period covered by thisreport based on such evaluation; and  (d) Disclosed in this report any change in theRegistrant’s internal control overfinancial reporting that occurred duringthe Registrant’s most recent fiscal quarter(the Registrant’s fourth fiscal quarter inthe case of an annual report) that hasmaterially affected, or is reasonablylikely to materially affect, theRegistrant’s internal control overfinancial reporting; and 5. The Registrant’s other certifying officer(s) and I have disclosed, based on our most recentevaluation of internal control over financial reporting, to the Registrant’s auditors and theaudit committee of the Registrant’s board of directors (or persons performing the equivalentfunctions): (a) All significant deficiencies and materialweaknesses in the design or operation ofinternal control over financial reportingwhich are reasonably likely to adverselyaffect the Registrant’s ability to record,process, summarize and report financialinformation; and  (b) Any fraud, whether or not material, thatinvolves management or other employees whohave a significant role in the Registrant’sinternal control over financial reporting.Date:May 8, 2008         /s/ Michael S. Herring   Michael S. Herring   Chief Financial Officer and Executive Vice President