I found a couple of envelopes from Lotus Certification center in the mail this morning. I wondered why there were 2 envelopes, as I've only done one exam recently (apart from the Sales Professional exam, which wasn't a "real" one). So it turns out, that the LotusScript 273 exam I sat 3 years ago for my R5 PCLP, also counts towards the R6 Advanced Developer Certification. So by sitting the 6/6.5 Application Developer exam, I'm now both an "IBM Certified Application Developer - Lotus Notes and Domino 6/6.5" as well as being an "IBM Certified Advanced Application Developer - Lotus Notes and Domino 6/6.5".
Oh, and I'm a Lotus Solution Sales Professional, but we won't talk about that one.