SAN FRANCISCO–Michael Dell came to town Feb. 27, and, as an IT man with a fair amount of gravitas, he commands attention–no matter what his message might be. At Dell's impressive spring data center press conference here at the marble-floored Julia Morgan Ballroom in the Financial District, the Austin, Texas-based company introduced a few new whiz-bang pieces of data center equipment. But its deeper purpose was to corral key media members and analysts in the same room and remind them of the main corporate message, which is this: When you think of Dell, you must think of it now as a full-service, end-to-end IT products and services provider. Oh yes, Dell continues to make notebook and desktop PCs, and it relishes being No. 1 in the world in those businesses. But it also knows quite well that the days of PCs owning the consumer and enterprise end-user markets are numbered. Dell hasn't been successful at getting its first tablet PCs and smartphones on the sales charts.