California accounting firms Burr Pilger Mayer and Andersen & Co. plan to merge on Jan. 1, 2009.\

Weaver and Tidwell is merging with Polansky McNutt Perry & Co., expanding Dallas-based Weaver into the San Antonio market.

Thomson Reuters has signed an agreement to acquire Paisley, a software developer that specializes in governance, risk and compliance software, especially for Sarbanes-Oxley compliance.

CPA firm Cottrill Arbutina Professional Services has acquired an eight-person tax and audit group from S.R. Snodgrass, expanding its reach in Western Pennsylvania and its auto dealership client base.

CBiz has signed a deal to acquire Mahoney Cohen, a New York-based accounting firm that is expected to contribute about $55 million in annual revenue next year.

Reilly, Penner & Benton said it has merged with another Wisconsin accounting firm, Ragsdale, Spitz & Reuschlein.

The National Association of Certified Valuation Analysts, promoter of the Certified Valuation Analyst credential, has purchased the National Litigation Consultants Review, a newsletter that caters to testifying financial experts.

Net@Work, a high-volume Sage reseller, has acquired Business Technology Solutions, a North Carolina-based VAR specializing in Sage MAS 90 and MAS 200, as well as Abra HRMS Accounting and Human Resources.

The Rehmann Group accounting firm said it plans to merge with another Michigan firm, Pridnia LaPres, effective Jan. 1, 2009.

RSM McGladrey has acquired Philadelphia accounting firm Simonson Lipschutz & Fogel for $6 million.

Habif, Arogeti & Wynne said all the shareholders and staff of Tauber & Balser have joined the firm, effective November 1, extending the Atlanta-based firm's forensic accounting and litigation support expertise.

New York-based accounting firm Citrin Cooperman has acquired its second Philadelphia-area firm, Matarazzo Goldis.

Crowe Horwath has signed an agreement with Grobstein Horwath that will effectively merge the two firms.

Accounting firm Eide Bailly has expanded by combining with three other practices: Gordon, Hughes & Banks; Keller, Young & Grover; and Magee, Rausch & Shelton.

CCH Small Firm Services, part of Wolters Kluwer Tax and Accounting, has acquired IntelliTax, a tax software company formerly known as Orrtax Software Solutions.

The Rehmann Group plans to merge with MSW Group to create Michigan's second largest wealth management and consulting firm. The merger is expected to take effect on Jan. 1, 2009. Financial terms of the deal were not disclosed.

Accounting firm LarsonAllen has combined with yet another firm - Davis, Keller and Wiggins - expanding its presence in the St. Louis area and its automobile dealership client base.

Kellogg & Andelson Accountancy is expanding its presence here by acquiring the West Los Angeles office of Kelson Rood Stoll & Winkler.

Oklahoma-based CPA firms Hogan & Slovacek and Tullius Taylor Sartain & Sartain said they would merge, effective Jan. 1, 2009.

WebsterRogers said it is merging in another South Carolina accounting firm, Bryan, Truesdale, Adkins & Williams.