A few weeks ago, Lawson announced its version of "SaaS". Ok, so it is not multi-tenant, and it is only one application, but I was impressed with IBM's pricing of $ 75 per user per month for the hosting and application management services.
I have written before incumbent customers of SAP, Oracle, Lawson and other enterprise apps cannot just toss their existing implementation and just move to a NetSuite. They would be better off with what I call SaCS.
Of course, in the same announcement Lawson says customers would need to "purchase maintenance contracts as they do currently". My definition of SaCS includes significantly lowered maintenance.
In the end what Lawson and IBM charge together has to be competitive with the single consolidated price of NetSuite or salesforce.com.
Still a ways to go.