well, since the source code is still 0.1.7 like for 3.x one could try the 3.x extension with just adding the appropriate modules of the current kernel
usr/local/lib/modules/2.6.33.3-tinycore/kernel/drivers/staging/usbip/usbip.ko.gz
usr/local/lib/modules/2.6.33.3-tinycore/kernel/drivers/staging/usbip/usbip_common_mod.ko.gz
usr/local/lib/modules/2.6.33.3-tinycore/kernel/drivers/staging/usbip/vhci-hcd.ko.gz
usbip is still in staging, so you would have to grab the tinycore kernel (patched) sources, enable usbip and make modules. I somehow lost the build script for usbip on TC 3.x *grml* but I compiled the modules externally, so you would have to do this in either case. FWIW I tested usbip and although it somehow and sometimes worked, it wasn't really reliable.