The bulk of the remaining offline wallet funds are funds held and currently untouchable in the offline wallets from the withholding attack over a year ago which is awaiting legal confirmation before I can distribute it to affected miners from that time period.
What can I do if a wallet from that time got compromised?
Nothing can be done on Eligius's side, since moving funds from one address to another is not possible.
Edit: I suppose you could sign options that donate 100% of the address's earnings, so at least whoever compromised your wallet wouldn't get the funds.