Should we use the letters æ and œ more in English?

Back in the good old days English had letters like œ and æ which were used to spell words like hæmatology, archæology, fæces, antennæ, diarrhœa and curriculum vitæ. You'll still see them in old books but they've fallen out of fashion in recent years.

Do any of you oldies remember them and do you miss the letters? By dumping them have we dumbed down English? Are there any other old letters we need to bring back into common use?
Should we use the letters æ and œ more in English?
Should we use the letters æ and œ more in English?
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