Rather than detailed, process-intensive consultancy/systems integration projects, strategy projects are typically short and sharp engagements, where clients do not necessarily require complete hand-holding, but rather pieces of advice, for critical stages in a project life-cycle. This of course will vary according to technological-domain or business-discipline.
Another way of viewing strategy = "the view from 30,000 feet."
i.e. the type of issues that CIO's/CTO's/IT directors typically face (for listing of top-10 issues visit www.metagroup.com; www.forrester.com, et.al.)
Conultancy offerings will differ according to both size and structure of firms, but typically one would associate tech strategy with the technology offerings of strategy houses (McK, BCG,et. al.) rather than say the big 5.