hi there,
very good, stable and fast is a GOA-ROM for ur S1...!
i used it in my S1 Times. (now i switched to S2)
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Also u could search (via XDA-Developers for Example) to SlimROM for ur I9000
(it has very much support)
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Kernels are very good from the dev 'Stratosk' (Kernel Name: Semaphore)...