Tadokoro et al. [1] experimentally confirmed more than 200 NAGNAGs. A complete list can be found here.
Other databases about alternative splicing (incomplete list):
Several of these databases (for example Fast DB, Hollywood, ASTRA) also contain NAGNAG acceptors and GYNGYN donors.
[1] Tadokoro K, Yamazaki-Inoue M, Tachibana M, Fujishiro
M, Nagao K, Toyoda M, Ozaki M, Ono M, Miki N, Miyashita T, and Yamada
M. Frequent
occurrence of protein isoforms with or without a single amino acid
residue by subtle alternative splicing: the case of Gln in DRPLA
affects subcellular localization of the products. J Hum Genet,
50(8):382-394, 2005