Well even though it's using 23MB, nothing else is wanting to use it right now so it's not wasted. Just let the OS do it's job, if the OS needs the space to service another app, it will swap skype out as part of the normal virtual memory operation.
OS X is big on lazy execution, which means don't do stuff before it's actually needed. Statistically, that is the most efficient way to run an OS over the long term. Swapping things or performing other operations when you don't really need to leads to thrashing where a system spends almost all it's effort mucking about and not getting any actual work done.
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